APA (7th ed.) Citation

Constance, L., & Shan, J. (1948). The genus Osmorhiza (Umbelliferae): A study in geographic affinities. University of California press.

Chicago Style (17th ed.) Citation

Constance, Lincoln, and Jen-hua Shan. The Genus Osmorhiza (Umbelliferae): A Study in Geographic Affinities. Berkeley: University of California press, 1948.

MLA (9th ed.) Citation

Constance, Lincoln, and Jen-hua Shan. The Genus Osmorhiza (Umbelliferae): A Study in Geographic Affinities. University of California press, 1948.