APA (7th ed.) Citation

Robbins, W. W., Bellus, M. K., & Ball, W. S. (1951). Weeds of California. Printing Div.

Chicago Style (17th ed.) Citation

Robbins, Wilfred W., Margaret K. Bellus, and Walter S. Ball. Weeds of California. Sacramento: Printing Div, 1951.

MLA (9th ed.) Citation

Robbins, Wilfred W., et al. Weeds of California. Printing Div, 1951.