To use FoxTrot cartoons in a book, magazine, commercial website or other publication, contact Mary Suggett at firstname.lastname@example.org or 816-581-7500.
For classroom/school use, I’m fine with you reprinting a strip or strips without permission so long as your use falls under the guidelines listed here. For academic uses that are broader or more complicated, contact Mary Suggett at my syndicate.
General Web Use:
For non-commercial websites, I’m generally okay with people reposting a strip now and then, so long as you include a link back to foxtrot.com.