Cita APA (7a ed.)

Willis, J., & Ross, T. (2010). Old dog. Andersen.

Cita Chicago Style (17a ed.)

Willis, Jeanne, y Tony Ross. Old Dog. london: Andersen, 2010.

Cita MLA (8a ed.)

Willis, Jeanne, y Tony Ross. Old Dog. Andersen, 2010.