Linking to the Platform


PLEASE NOTE: This information was updated in August 2023 following the Credo platform refresh. For more about the update see here, or contact

Persistent Links to Credo Online Reference Service

You can link to Credo Online Reference Service content in a variety of ways. Here is an overview of the link syntax Credo uses.

Basic home page link for Credo:


Permalinking with AID****

The Permalink URLs available in the header of all pages are the best links to use as persistent links. On entries, a permalink can additionally be found in the "Share" menu and "Record URL" at the bottom of the page (see screenshots below). 

These links will include your AID (account identifier) information, which will direct remote users to your preferred remote access method. If this method needs to be updated, please contact

For more on the aid= function, see our article here:


Home page showing header menu link (present on every page of the site):


Entry page showing "Share" menu:

Share Menu.png


Entry Page showing Record URL value: 

Read below for more information on linking to:

Find a Book
Titles by subject
Single title
Specific tabs for a title
Search page
Search results

Linking to the Find a Book page

This link leads to the title list page, where you can view a list of all titles within your account.

Linking to titles about a subject

This link style leads to the title list for a selected subject. Example:

Click here for a full list of subject URLs.

Linking to title pages

Every title in Credo Online Reference Service has a unique URL. This URL defaults to the "Contents" page of the book (where available).

To construct these links, replace bookhash with the hash value for the book. For example, to link to the "Contents" page for The Brain Book:

You can take these URLs from the "Copy Link" function in the header of the Credo platform (the chain icon), or authorized Admins can download a title list complete with these links from the Credo Admin account. To learn more about this and other Admin functions, see our Admin Help Page.

Other tabs under Find a Book can be linked to directly. Note that not every book has the same available tabs.

  • - to link to a book's Table of Contents (if none present, defaults to the headings list)
  • link to a book's headings list
  • - to link to a book's image list
  • - to link to a book's audio file list
  • - to link to a book's video list

Linking to an individual entry

Every entry has a unique persistent URL that can be found in the "Share" menu function. It is also present in the citation found in the "cite" menu function, although it lacks the AID.

The Permalink for each entry is the best guide to the proper URL.

Linking to a custom start page

There are four different pages on which a user may start a search. Each can be linked to directly from outside Credo Online Reference Service:

Linking to search results

You can perform a keyword search with your URL. Example:


Replace TERM with the desired keyword search.

You can add a subject limit to the query by adding a subjectcode parameter. E.g.

The best place to find the URLs with the subject codes is the permalink function of the Credo platform, or find a list here (2nd tab). 

Notes on linking:

  1. If the user cannot be automatically authenticated using a TCP/IP address or a referring URL, then the login page will be shown. After entering a valid login, the user will then see the requested page.
  2. If you use a proxy for access, you may find that additional parameters of some deeplinks are dropped when going through the proxy. To resolve this, update your proxy prefix in Credo Admin to use qurl= instead of url= at the end, and check the box "My proxy requires URL encoding", or contact for help. 
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