Description
This plugin will let you manage the post references. It is like “node reference” in Drupal CMS module functionality.
Use Reference Settings page to configure publications connections.
After configuring step you will see additional metabox(s) on post editor page. Now you can choose articles of referenced post types to attach it to article you edit.
Plugin stores connected article list to post metas. For template you can use, for example, get_post_meta($post->ID, ‘_ref_ID’, true) to receive that list. As ‘ref_ID’ you should use a meta key configured on Referenced settings page earlier.
Plugin allow you to configure widgets to view the list(s) of attached articles.
Plugin API
Plugin has own API which allows you create references from your code (after registering your own post types, etc). All functions are static and available through class REFShraAPI.
Currently there are implemented 5 functions. List of functions is below. More details about API functions, their arguments, examples look in referenece.php.
REFShraAPI::config_load($postType = NULL, $refKey = NULL);
//returns array currently configured REFERENCES.
REFShraAPI::config_add($postType, $refKey, $linkedTypes, $title)
// ADD/update REFERENCE configs.
REFShraAPI::config_remove($postType, $refKey);
// Delete REFERENCE config by pair postType / refKey.
REFShraAPI::get($postID = NULL);
// Get references data by post ID.
REFShraAPI::update($postID = NULL, $refkey, $postIDs);
// Update references data by post ID.
REFShraAPI::find($postID = NULL, $postTypes = array(), $onlyPublished = false);
// Search for article with attached post_id
Shortcode REF
Plugin supports shortcode REF. It allows to show list of referenced articles in any place of your post. Shortcode function implementation allows you customize list and output. Only two attributes are available.
[ref id=”POST_ID” key=”REFERENCE_KEY”]
Screenshots
Install References plugin. 
The References settings page. 
Build article connections. 
Configure widget(s). 
Created widget view. 
Using REF shortcode in post editor. 
REF shortcode rendered on frontend.
Installation
Best is to install directly from WordPress. If manual installation is required, please make sure that the plugin files are in a folder named “references”, usually “wp-content/plugins”.
Contributors & Developers
“References” is open source software. The following people have contributed to this plugin.
Contributors
Translate “References” into your language.
Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.2
New API function REFShraAPI::find // returns array of articles where attached given article (as post_id).
1.1
Added implementation referesence list shortdcode – ref.
[ref id=”POST_ID” key=”REFERENCE_KEY”]
Added reference API. You can use in your code static functions of special class REFShraAPI. Now 5 functions are available. More details about API functions, their arguments, examples look in referenece.php.
REFShraAPI::config_load($postType = NULL, $refKey = NULL); //returns array currently configured REFERENCES.
REFShraAPI::config_add($postType, $refKey, $linkedTypes, $title) // ADD/update REFERENCE configs.
REFShraAPI::config_remove($postType, $refKey); // Delete REFERENCE config by pair postType / refKey.
REFShraAPI::get($postID = NULL); // Get references data by post ID.
REFShraAPI::update($postID = NULL, $refkey, $postIDs); // Update references data by post ID.
1.02
Fixed bug with empty value reference case.
1.01
Few cosmetic changes. Main change is next – plugin now allows to manage all post types with show_ui flag instead of post types with public flag.
1.0
Includes an admin page with plugin setting and Widgets.