Answered By: Jennifer Bazeley
Last Updated: Sep 26, 2021     Views: 54

Q: Why do I sometimes see multiple e-book options when I click on an e-book link in the library catalog?
Answered by: Jennifer Bazeley

Sometimes the same e-book is published by multiple vendors on separate platforms. In order to uniquely identify e-books, vendors register them with an organization called CrossRef to receive Digital Object Identifiers, or DOIs. DOIs are unique and can be used to create stable links that look like this:

Yale uses these links in the library catalog because they are stable and permanent.

If an e-book is published by multiple vendors and has a DOI link like the one above, the link may open to a special "co-access" page.

To access Yale's copy, click on the Go to content link in the highlighted "clicked link" entry:

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