Cita APA (7th ed.)

Mayer, M., & Mayer, M. (2003). A boy, a dog, a frog, and a friend. Dial Books for Young Readers.

Cita Chicago (17th ed.)

Mayer, Mercer, i Marianna Mayer. A Boy, a Dog, a Frog, and a Friend. New York: Dial Books for Young Readers, 2003.

Cita MLA (8th ed.)

Mayer, Mercer, i Marianna Mayer. A Boy, a Dog, a Frog, and a Friend. Dial Books for Young Readers, 2003.