APA (7th ed.) Citation

Blume, J. (1971). Then again, maybe I won't. Simon & Schuster Books For Young Readers.

Chicago Style (17th ed.) Citation

Blume, Judy. Then Again, Maybe I Won't. New York: Simon & Schuster Books For Young Readers, 1971.

MLA (9th ed.) Citation

Blume, Judy. Then Again, Maybe I Won't. Simon & Schuster Books For Young Readers, 1971.

Warning: These citations may not always be 100% accurate.