Cita APA (7th ed.)
PETERSEN, D., & ALEXANDER, G. (1993). SEASONAL VARIATION IN ADOLESCENT CONCEPTIONS, INDUCED ABORTIONS, AND LATE INITIATION OF PRENATAL CARE.
Cita Chicago (17th ed.)
PETERSEN, D.J, i G.R ALEXANDER. SEASONAL VARIATION IN ADOLESCENT CONCEPTIONS, INDUCED ABORTIONS, AND LATE INITIATION OF PRENATAL CARE. 1993.
Cita MLA (9th ed.)
PETERSEN, D.J, i G.R ALEXANDER. SEASONAL VARIATION IN ADOLESCENT CONCEPTIONS, INDUCED ABORTIONS, AND LATE INITIATION OF PRENATAL CARE. 1993.
Atenció: Aquestes cites poden no estar 100% correctes.