APA (7th ed.) Citation

Kepner, R. A., Bainer, R., & Barger, E. L. (1978). Principles of farm machinery (3rd ed.). Avi.

Chicago Style (17th ed.) Citation

Kepner, Robert Allen, Roy Bainer, and E. L. Barger. Principles of Farm Machinery. 3rd ed. Westport, Conn.: Avi, 1978.

MLA (9th ed.) Citation

Kepner, Robert Allen, et al. Principles of Farm Machinery. 3rd ed. Avi, 1978.