APA (7th ed.) Citation

Ahrens, C. L., Williamson, P. C., & Fleming, H. S. (1978). Directory, U.S. fertilizer port facilities. National Fertilizer Development Center.

Chicago Style (17th ed.) Citation

Ahrens, Curtis L., Phebus C. Williamson, and Herron S. Fleming. Directory, U.S. Fertilizer Port Facilities. Muscle Shoals, Ala.: National Fertilizer Development Center, 1978.

MLA (9th ed.) Citation

Ahrens, Curtis L., et al. Directory, U.S. Fertilizer Port Facilities. National Fertilizer Development Center, 1978.