Cita APA (7th ed.)

Smith, G. M. (1950). The fresh-water algae of the United States (2a. ed.). McGraw-Hill.

Cita Chicago (17th ed.)

Smith, Gilbert Morgan. The Fresh-water Algae of the United States. 2a. ed. Nueva York: McGraw-Hill, 1950.

Cita MLA (9th ed.)

Smith, Gilbert Morgan. The Fresh-water Algae of the United States. 2a. ed. McGraw-Hill, 1950.