APA aipamena

Mason, L. E. (1975). Letter: Unwanted pregnancies.

Chicago Style aipamena

Mason, L. E. Letter: Unwanted Pregnancies. 1975.

MLA aipamena

Mason, L. E. Letter: Unwanted Pregnancies. 1975.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.