APA (7th ed.) Citation

Clausen, J., Keck, D. D., & Hiesey, W. M. (1948). Experimental studies on the nature of species. Carnegie Institution.

Chicago Style (17th ed.) Citation

Clausen, Jens, David D. Keck, and William M. Hiesey. Experimental Studies on the Nature of Species. Washington: Carnegie Institution, 1948.

MLA (9th ed.) Citation

Clausen, Jens, et al. Experimental Studies on the Nature of Species. Carnegie Institution, 1948.