APA (7th ed.) Zitazioa
SCHRAMM, W. (1997). SMOKING DURING PREGNANCY: MISSOURI LONGITUDINAL STUDY.
Chicago Style (17th ed.) Zitazioa
SCHRAMM, W.F. SMOKING DURING PREGNANCY: MISSOURI LONGITUDINAL STUDY. 1997.
MLA (9th ed.) Zitazioa
SCHRAMM, W.F. SMOKING DURING PREGNANCY: MISSOURI LONGITUDINAL STUDY. 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.