APA (7th ed.) Citation

Villee, C. A., Walker, W. J. F., & Barnes, R. D. (1979). Introduction to animal biology. Saunders.

Chicago Style (17th ed.) Citation

Villee, Claude A., Warren Jr. F. Walker, and Robert D. Barnes. Introduction to Animal Biology. Philadelphia: Saunders, 1979.

MLA (9th ed.) Citation

Villee, Claude A., et al. Introduction to Animal Biology. Saunders, 1979.