APA (7th ed.) Citation

Willis, J. C. (1949). The birth and spread of plants. Chronica Botanica Co..

Chicago Style (17th ed.) Citation

Willis, John Christopher. The Birth and Spread of Plants. Waltham, Mass.: Chronica Botanica Co., 1949.

MLA (9th ed.) Citation

Willis, John Christopher. The Birth and Spread of Plants. Chronica Botanica Co., 1949.