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EBook Central will create a persistent URL for you. You must add the Proxy Server Prefix yourself.
(PLEASE NOTE: If you are creating persistent links OFF-CAMPUS, Ebook Central will add a Proxy Server Prefix for you. It will look different - this is an example: https://dbproxy.lasalle.edu:5967/lib/lasalle-ebooks/detail.action?docID=4388388)
When you Click on the Share Link to Book icon a new box opens with the persistent URL
Add the Proxy Server Prefix (Make sure there are no extra spaces):