Cita APA (7a ed.)

Willis, J., & Ross, T. (2012). Hippospotamus (American ed.). Andersen Press USA : Distributed in the United States by Lerner.

Cita Chicago Style (17a ed.)

Willis, Jeanne, y Tony Ross. Hippospotamus. American ed. Minneapolis: Andersen Press USA : Distributed in the United States by Lerner, 2012.

Cita MLA (8a ed.)

Willis, Jeanne, y Tony Ross. Hippospotamus. American ed. Andersen Press USA : Distributed in the United States by Lerner, 2012.