APA (7th ed.) Citation

Parkins, A. E., Whitaker, J. R., Atwood, W. W., & Baker, O. E. (1939). Our natural resources and their conservation (2d ed.). J. Wiley.

Chicago Style (17th ed.) Citation

Parkins, A. E., Joe Russell Whitaker, Wallace Walter Atwood, and O. E. Baker. Our Natural Resources and Their Conservation. 2d ed. New York: J. Wiley, 1939.

MLA (9th ed.) Citation

Parkins, A. E., et al. Our Natural Resources and Their Conservation. 2d ed. J. Wiley, 1939.