APA (7th ed.) Citation

Spinelli, E., & Valério, G. (2006). When you are happy. Simon & Schuster Books for Young Readers.

Chicago Style (17th ed.) Citation

Spinelli, Eileen, and Geraldo Valério. When You Are Happy. New York: Simon & Schuster Books for Young Readers, 2006.

MLA (8th ed.) Citation

Spinelli, Eileen, and Geraldo Valério. When You Are Happy. Simon & Schuster Books for Young Readers, 2006.