APA (7th ed.) Citation

Seuss, D., Prelutsky, J., & Smith, L. (1998). Hooray for Diffendoofer Day! Knopf.

Chicago Style (17th ed.) Citation

Seuss, Dr, Jack Prelutsky, and Lane Smith. Hooray for Diffendoofer Day! New York: Knopf, 1998.

MLA (8th ed.) Citation

Seuss, Dr, et al. Hooray for Diffendoofer Day! Knopf, 1998.

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