Walters, M., & Robbins, M. B. (1994). Birds' eggs (1st American ed.). Dorling Kindersley.
Cita Chicago Style (17a ed.)Walters, Michael, y Mark B. Robbins. Birds' Eggs. 1st American ed. London ; New York: Dorling Kindersley, 1994.
Cita MLA (8a ed.)Walters, Michael, y Mark B. Robbins. Birds' Eggs. 1st American ed. Dorling Kindersley, 1994.
Precaución: Estas citas no son 100% exactas.