diff --git a/lang/Localization_en.json b/lang/Localization_en.json
index 0cd7b3fd1..c67d14dfe 100644
--- a/lang/Localization_en.json
+++ b/lang/Localization_en.json
@@ -56,6 +56,7 @@
     "languages.alphabetical.none": "Alphabetical index of absolutely no languages",
     "languages.alphabetical.one": "Alphabetical index of the single language",
     "languages.title": "Languages",
+    "links.title": "Links",
     "mail.messagenotsent": "Message could not be sent.",
     "mail.messagesent": "Message has been sent",
     "paging.next.alternate": "Next",
diff --git a/lib/Book.php b/lib/Book.php
index f8d18f40c..a35776a23 100644
--- a/lib/Book.php
+++ b/lib/Book.php
@@ -58,6 +58,8 @@
 define ('SQL_BOOKS_BY_RATING', 'select {0} from books ' . SQL_BOOKS_LEFT_JOIN . '
                                                     where books_ratings_link.book = books.id and ratings.id = ? {1} order by sort');
 
+require('Identifier.php');
+
 class Book extends Base
 {
     const ALL_BOOKS_UUID = 'urn:uuid';
@@ -104,6 +106,7 @@ class Book extends Base
     public $publisher = NULL;
     public $serie = NULL;
     public $tags = NULL;
+    public $identifiers = NULL;
     public $languages = NULL;
     public $format = array ();
 
@@ -228,6 +231,28 @@ public function getTagsName() {
         return implode(', ', array_map(function ($tag) { return $tag->name; }, $this->getTags()));
     }
 
+
+    /**
+     * @return Identifiers[]
+     */
+    public function getIdentifiers() {
+        if (is_null ($this->identifiers)) {
+            $this->identifiers = array();
+
+            $result = parent::getDb()->prepare('select type, val, id
+                from identifiers
+                where book = ?
+                order by type');
+            $result->execute(array($this->id));
+            while ($post = $result->fetchObject())
+            {
+                array_push($this->identifiers, new Identifier($post));
+            }
+            
+        }
+        return $this->identifiers;
+    }
+
     /**
      * @return Data[]
      */
diff --git a/lib/Identifier.php b/lib/Identifier.php
new file mode 100644
index 000000000..26682922e
--- /dev/null
+++ b/lib/Identifier.php
@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * COPS (Calibre OPDS PHP Server) class file
+ *
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ * @author     SenorSmartyPants <senorsmartypants@gmail.com>
+ */
+
+class Identifier
+{
+    public $id;
+    public $type;
+    public $formattedType;
+    public $val;
+
+    public function __construct($post)
+    {
+        $this->id = $post->id;
+        $this->type = strtolower($post->type);;
+        $this->val = $post->val;
+        $this->formatType();
+    }
+
+    function formatType()
+    {
+        if ($this->type == 'amazon') {
+            $this->formattedType = "Amazon";
+            $this->uri = sprintf("https://amazon.com/dp/%s", $this->val);
+        } else if ($this->type == "asin") {
+            $this->formattedType = $this->type;
+            $this->uri = sprintf("https://amazon.com/dp/%s", $this->val);
+        } else if (substr($this->type, 0, 7) == "amazon_") {
+            $this->formattedType = sprintf("Amazon.co.%s", substr($this->type, 7));
+            $this->uri = sprintf("https://amazon.co.%s/dp/%s", substr($this->type, 7), $this->val);
+        } else if ($this->type == "isbn") {
+            $this->formattedType = "ISBN";
+            $this->uri = sprintf("https://www.worldcat.org/isbn/%s", $this->val);
+        } else if ($this->type == "doi") {
+            $this->formattedType = "DOI";
+            $this->uri = sprintf("https://dx.doi.org/%s", $this->val);
+        } else if ($this->type == "douban") {
+            $this->formattedType = "Douban";
+            $this->uri = sprintf("https://book.douban.com/subject/%s", $this->val);
+        } else if ($this->type == "goodreads") {
+            $this->formattedType = "Goodreads";
+            $this->uri = sprintf("https://www.goodreads.com/book/show/%s", $this->val);
+        } else if ($this->type == "google") {
+            $this->formattedType = "Google Books";
+            $this->uri = sprintf("https://books.google.com/books?id=%s", $this->val);
+        } else if ($this->type == "kobo") {
+            $this->formattedType = "Kobo";
+            $this->uri = sprintf("https://www.kobo.com/ebook/%s", $this->val);
+        } else if ($this->type == "litres") {
+            $this->formattedType = "ЛитРес";
+            $this->uri = sprintf("https://www.litres.ru/%s", $this->val);
+        } else if ($this->type == "issn") {
+            $this->formattedType = "ISSN";
+            $this->uri = sprintf("https://portal.issn.org/resource/ISSN/%s", $this->val);
+        } else if ($this->type == "isfdb") {
+            $this->formattedType = "ISFDB";
+            $this->uri = sprintf("http://www.isfdb.org/cgi-bin/pl.cgi?%s", $this->val);
+        } else if ($this->type == "lubimyczytac") {
+            $this->formattedType = "Lubimyczytac";
+            $this->uri = sprintf("https://lubimyczytac.pl/ksiazka/%s/ksiazka", $this->val);
+        } else if ($this->type == "url") {
+            $this->formattedType = $this->type;
+            $this->uri = $this->val;
+        } else {
+            $this->formattedType = $this->type;
+            $this->uri = '';
+        }
+    }
+
+    public function getUri()
+    {
+        return $this->uri;
+    }
+}
diff --git a/lib/JSON_renderer.php b/lib/JSON_renderer.php
index 851ea0487..12fd2a6be 100644
--- a/lib/JSON_renderer.php
+++ b/lib/JSON_renderer.php
@@ -107,6 +107,12 @@ public static function getFullBookContentArray ($book) {
             $link = new LinkNavigation ($tag->getUri ());
             array_push ($out ["tags"], array ("name" => $tag->name, "url" => $link->hrefXhtml ()));
         }
+
+        $out ["identifiers"] = array ();
+        foreach ($book->getIdentifiers () as $ident) {
+            array_push ($out ["identifiers"], array ("name" => $ident->formattedType, "url" => $ident->getUri ()));
+        }
+
         $out ["customcolumns_preview"] = $book->getCustomColumnValues($config['cops_calibre_custom_column_preview'], true);
 
         return $out;
@@ -146,6 +152,7 @@ public static function addCompleteArray ($in) {
                            "authorsTitle" => localize("authors.title"),
                            "bookwordTitle" => localize("bookword.title"),
                            "tagsTitle" => localize("tags.title"),
+                           "linksTitle" => localize("links.title"),
                            "seriesTitle" => localize("series.title"),
                            "customizeTitle" => localize ("customize.title"),
                            "aboutTitle" => localize ("about.title"),