APA (7th ed.) Citation

Sand, P. F. (1990). Witchweed research and control in the United States. Weed Science Society of America.

Chicago Style (17th ed.) Citation

Sand, Paul F. Witchweed Research and Control in the United States. Champaign, IL: Weed Science Society of America, 1990.

MLA (9th ed.) Citation

Sand, Paul F. Witchweed Research and Control in the United States. Weed Science Society of America, 1990.