APA

Smith G. M., . (1950). The fresh-water algae of the United States. New York: McGraw-Hill.

Chicago

Smith Gilbert Morgan, . 1950. The fresh-water algae of the United States. New York: McGraw-Hill.

Harvard

Smith G. M., . (1950). The fresh-water algae of the United States. New York: McGraw-Hill.

MLA

Smith Gilbert Morgan, . The fresh-water algae of the United States. New York: McGraw-Hill. 1950.