Board Thread:Questions and Answers/@comment-24860884-20150319005214/@comment-24860884-20150319011458

It seems that most of the Wikia prefer leaving the apostrophes out of the brackets, but I've seen a wikia where leaving the whole possessive noun is required.

Link to the rules: http://gravityfalls.wikia.com/wiki/Gravity_Falls_Wiki:Article_Guidelines#References

Also, they have their own Tumblr. Link to that is on the main page.