APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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