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:
https://doi.org/10.1215/9780822375340
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:
