APA (7th ed.) Citation

Babcock, E. B., & Stebbins, G. L. (1938). The American species of Crepis: Their interrelationships and distribution as affected by polyploidy and apomixis. Carnegie institution of Washington.

Chicago Style (17th ed.) Citation

Babcock, E. B., and G. Ledyard Stebbins. The American Species of Crepis: Their Interrelationships and Distribution as Affected by Polyploidy and Apomixis. Washington, D.C.: Carnegie institution of Washington, 1938.

MLA (9th ed.) Citation

Babcock, E. B., and G. Ledyard Stebbins. The American Species of Crepis: Their Interrelationships and Distribution as Affected by Polyploidy and Apomixis. Carnegie institution of Washington, 1938.