APA (7th ed.) Citation

Willard, N., & DePaola, T. (1977). Simple pictures are best. Harcourt Brace Jovanovich.

Chicago Style (17th ed.) Citation

Willard, Nancy, and Tomie DePaola. Simple Pictures Are Best. New York: Harcourt Brace Jovanovich, 1977.

MLA (9th ed.) Citation

Willard, Nancy, and Tomie DePaola. Simple Pictures Are Best. Harcourt Brace Jovanovich, 1977.