APA (7th ed.) Citation

Clausen, J., Keck, D. D., & Hiesey, W. M. (1972). Experimental studies on the nature of species (2. printing 1949, reprined 1972.). Carnegie Institution.

Chicago Style (17th ed.) Citation

Clausen, Jens, David D. Keck, and William M. Hiesey. Experimental Studies on the Nature of Species. 2. printing 1949, reprined 1972. Washington: Carnegie Institution, 1972.

MLA (9th ed.) Citation

Clausen, Jens, et al. Experimental Studies on the Nature of Species. 2. printing 1949, reprined 1972. Carnegie Institution, 1972.