APA aipamena

Janet L Hopson. (1990). Essentials of biology. New York: McGraw-Hill.

Chicago Style aipamena

Janet L Hopson. Essentials of Biology. New York: McGraw-Hill, 1990.

MLA aipamena

Janet L Hopson. Essentials of Biology. New York: McGraw-Hill, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.