APA (7th ed.) Citation

Weed Science Society of America. (1968). Abstracts ... meeting of the Weed Science Society of America. The Society.

Chicago Style (17th ed.) Citation

Weed Science Society of America. Abstracts ... Meeting of the Weed Science Society of America. [United States]: The Society, 1968.

MLA (9th ed.) Citation

Weed Science Society of America. Abstracts ... Meeting of the Weed Science Society of America. The Society, 1968.