APA (7th ed.) Citation

Young, R., & Ernst, L. C. (1994). Who says moo? Viking.

Chicago Style (17th ed.) Citation

Young, Ruth, and Lisa Campbell Ernst. Who Says Moo? New York, N.Y., U.S.A.: Viking, 1994.

MLA (8th ed.) Citation

Young, Ruth, and Lisa Campbell Ernst. Who Says Moo? Viking, 1994.

Warning: These citations may not always be 100% accurate.