APA (7th ed.) Citation

Beals, R. L., Beals, A. R., & Hoijer, H. (1977). An introduction to anthropology. Macmillan Publishing Co., Inc.

Chicago Style (17th ed.) Citation

Beals, Ralph Leon, Alan R. Beals, and Harry Hoijer. An Introduction to Anthropology. New York: Macmillan Publishing Co., Inc, 1977.

MLA (9th ed.) Citation

Beals, Ralph Leon, et al. An Introduction to Anthropology. Macmillan Publishing Co., Inc, 1977.