What determines whether an owned resource is hyperlinked when cited?

Francis
Member Posts: 3,954 ✭✭✭
I encounter fairly regularly this sort of situation: some books are cross-referenced with hyperlinks that lead to the owned resource. Others are not.
What accounts for this? Tagging at the time of the Logos publication (ie., if a book wasn't available then, it was not tagged)? Bibliography vs. specific reference? A need to reindex when acquiring new resources?
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