Cita APA

Numeroff, L. J., & McPhail, D. (2006). When sheep sleep. Abrams Books for Young Readers.

Citación estilo Chicago

Numeroff, Laura Joffe, and David McPhail. When Sheep Sleep. New York: Abrams Books for Young Readers, 2006.

Cita MLA

Numeroff, Laura Joffe, and David McPhail. When Sheep Sleep. Abrams Books for Young Readers, 2006.