I'm a newly-registered Wikibookian and currently contribute to the Muggles' Guide to Harry Potter — come help us out there!
Here are some things you can do at the Muggles' Guide:
Italicise all occurrences of spell incantations but not their other names, especially at the title of templates on spell pages and on the Magic page. (e.g. Avada Kedavra is the Killing Curse)
Write all occurrences of book names in full and italicise them. (e.g. Harry Potter and the Goblet of Fire)
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