Cita APA (7th ed.)

Mayer, M. (2008). It's Earth Day! HarperFestival.

Cita Chicago (17th ed.)

Mayer, Mercer. It's Earth Day! New York: HarperFestival, 2008.

Cita MLA (8th ed.)

Mayer, Mercer. It's Earth Day! HarperFestival, 2008.