APA

Smith G. M., . (1933). The fresh-water algae of United States. New York: Mcgraw-Hill Book Company.

Chicago

Smith Gilbert M, . 1933. The fresh-water algae of United States. New York: Mcgraw-Hill Book Company.

Harvard

Smith G. M., . (1933). The fresh-water algae of United States. New York: Mcgraw-Hill Book Company.

MLA

Smith Gilbert M, . The fresh-water algae of United States. New York: Mcgraw-Hill Book Company. 1933.