APA (7th ed.) Citation

Smith, E. T. (1949). Exploring biology (3d ed.). Harcourt, Brace.

Chicago Style (17th ed.) Citation

Smith, Ella Thea. Exploring Biology. 3d ed. New York: Harcourt, Brace, 1949.

MLA (9th ed.) Citation

Smith, Ella Thea. Exploring Biology. 3d ed. Harcourt, Brace, 1949.