APA (7th ed.) Citation

Clausen, J. C., Keck, D. D., & Hiesey, W. M. (1940). Experimental studies on the nature of species. Gibson Brothers.

Chicago Style (17th ed.) Citation

Clausen, Jens Christian, David Daniels Keck, and William McKinley Hiesey. Experimental Studies on the Nature of Species. Washington, D.C.: Gibson Brothers, 1940.

MLA (9th ed.) Citation

Clausen, Jens Christian, et al. Experimental Studies on the Nature of Species. Gibson Brothers, 1940.