APA (7th ed.) Citation

Muenscher, W. C. L., & Petry, L. C. (1946). Keys to spring plants (5th ed., rev.). Comstock Publishing Co..

Chicago Style (17th ed.) Citation

Muenscher, Walter Conrad Leopold, and Loren C. Petry. Keys to Spring Plants. 5th ed., rev. Ithaca, N.Y.: Comstock Publishing Co., 1946.

MLA (9th ed.) Citation

Muenscher, Walter Conrad Leopold, and Loren C. Petry. Keys to Spring Plants. 5th ed., rev. Comstock Publishing Co., 1946.