Cita APA (7a ed.)

Bailey, J., & Thompson, C. (1993). Planet earth. Oxford University Press.

Cita Chicago Style (17a ed.)

Bailey, Jill, y Catherine Thompson. Planet Earth. Oxford: Oxford University Press, 1993.

Cita MLA (9a ed.)

Bailey, Jill, y Catherine Thompson. Planet Earth. Oxford University Press, 1993.