Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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