APA aipamena

Eastman, N., & Hellman, L. M. (1961). Williams Obstetrics.

Chicago Style aipamena

Eastman, Nicholson, and Louis M. Hellman. Williams Obstetrics. 1961.

MLA aipamena

Eastman, Nicholson, and Louis M. Hellman. Williams Obstetrics. 1961.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.