Say you're making a magic item using uncommon rules, such as Ship Combat or Boons. Would you just add a line of (see Fast-Play Ship Combat) after the effect that uses language from the rule?
See this thread, it might help you out :)
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In a book, we'd normally say something like this:
"When controlling a ship, the wearer gains a +2 competence bonus on ship combat rolls (NameOfRelevantBook, page ##)."