APA (7th ed.) Citation

Whitford, L. A., & Schumacher, G. J. (1984). A manual of fresh-water algae (revised.). Sparks Press.

Chicago Style (17th ed.) Citation

Whitford, L. A., and G. J. Schumacher. A Manual of Fresh-water Algae. revised. Raleigh: Sparks Press, 1984.

MLA (9th ed.) Citation

Whitford, L. A., and G. J. Schumacher. A Manual of Fresh-water Algae. revised. Sparks Press, 1984.