APA (7th ed.) Citation

Round, F. E. (1973). The biology of the algae (2nd ed.).

Chicago Style (17th ed.) Citation

Round, F. E. The Biology of the Algae. 2nd ed. New York, st. martin's Press, 1973.

MLA (9th ed.) Citation

Round, F. E. The Biology of the Algae. 2nd ed. 1973.