Cita APA (7a ed.)

Walker, C. A., & Ward, D. (1996). Fossils. Dorling Kindersley.

Cita Chicago Style (17a ed.)

Walker, Cyril Alexander, y David Ward. Fossils. London [etc.]: Dorling Kindersley, 1996.

Cita MLA (9a ed.)

Walker, Cyril Alexander, y David Ward. Fossils. Dorling Kindersley, 1996.