APA (7th ed.) Citation

Cowles, H. C., & Coulter, J. G. (1915). A spring flora for high schools. American book company.

Chicago Style (17th ed.) Citation

Cowles, Henry Chandler, and John G. Coulter. A Spring Flora for High Schools. New York, Cincinnati [etc.]: American book company, 1915.

MLA (9th ed.) Citation

Cowles, Henry Chandler, and John G. Coulter. A Spring Flora for High Schools. American book company, 1915.