APA (7th ed.) Citation

Drouet, F., & Daily, W. A. (1939). The planktonic freshwater species of microcystis.

Chicago Style (17th ed.) Citation

Drouet, Francis, and William A. Daily. The Planktonic Freshwater Species of Microcystis. Chicago, 1939.

MLA (9th ed.) Citation

Drouet, Francis, and William A. Daily. The Planktonic Freshwater Species of Microcystis. 1939.

Warning: These citations may not always be 100% accurate.