Cita APA (7a ed.)

King-Smith, D., & Grant-Bear, C. (1997). The sheep-pig. Penguin Books.

Cita Chicago Style (17a ed.)

King-Smith, Dick, y Chris Grant-Bear. The Sheep-pig. London: Penguin Books, 1997.

Cita MLA (9a ed.)

King-Smith, Dick, y Chris Grant-Bear. The Sheep-pig. Penguin Books, 1997.