APA (7th ed.) Citation

Clausen, J. C., Keck, D. D., & Hiesey, W. M. (1940). Experimental studies on the nature of species: I- Effect of varied environments on Western North American plants. Carnegie Institution of Washington.

Chicago Style (17th ed.) Citation

Clausen, Jens Christian, David Daniels Keck, and William McKinley Hiesey. Experimental Studies on the Nature of Species: I- Effect of Varied Environments on Western North American Plants. Washington, D. C.: Carnegie Institution of Washington, 1940.

MLA (9th ed.) Citation

Clausen, Jens Christian, et al. Experimental Studies on the Nature of Species: I- Effect of Varied Environments on Western North American Plants. Carnegie Institution of Washington, 1940.