Exclude the following ingredients: orange juice, orange peel, lemon juice, lemon peel,  lime juice, lime peel, mandarin orange, tangerine, clementine

Websites with citrus-free recipes:

http://www.maycontainyum.com/site/page.php?node=374&subjectfilterid=353&subject=Citrus-free

http://recipes.sparkpeople.com/cookbooks.asp?cookbook=472804

Also exclude lemon pepper, grapefruit juice/peel, blood orange, citron, pomelo, tangelo, kumquat.

Exclude jellies, jams, marmalades, and concentrates of all of the above.

I don't know if it is found in many recipes, but exclude citric acid. (It sure is hard to avoid in commercial products.)