APA (7th ed.) Citation

Curtis, H. (1975). Biology (2nd ed.). Worth Publ..

Chicago Style (17th ed.) Citation

Curtis, Helena. Biology. 2nd ed. New York: Worth Publ., 1975.

MLA (9th ed.) Citation

Curtis, Helena. Biology. 2nd ed. Worth Publ., 1975.

Warning: These citations may not always be 100% accurate.