APA (7th ed.) Citation

Geisel, T. S. (1940). Horton hatches the egg. Random House.

Chicago Style (17th ed.) Citation

Geisel, Theodore Seuss. Horton Hatches the Egg. New York: Random House, 1940.

MLA (9th ed.) Citation

Geisel, Theodore Seuss. Horton Hatches the Egg. Random House, 1940.

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