Cita APA (7a ed.)

Strasser, T., & Foley, M. (1997). Free Willy. Penguin Books.

Cita Chicago Style (17a ed.)

Strasser, Todd, y Mark Foley. Free Willy. London: Penguin Books, 1997.

Cita MLA (9a ed.)

Strasser, Todd, y Mark Foley. Free Willy. Penguin Books, 1997.