Cita APA (7th ed.)

Wehr, J. D., & Sheath, R. G. (2003). Freshwater algae of North America: Ecology and classification. Academic Press.

Cita Chicago (17th ed.)

Wehr, John D., i Robert G. Sheath. Freshwater Algae of North America: Ecology and Classification. San Diego, Calif: Academic Press, 2003.

Cita MLA (9th ed.)

Wehr, John D., i Robert G. Sheath. Freshwater Algae of North America: Ecology and Classification. Academic Press, 2003.