Oblepias, V. R. (1977). Contraception by surgery. New Day.
Cita Chicago (17th ed.)Oblepias, Virgilio R. Contraception by Surgery. Quezon City: New Day, 1977.
Cita MLA (9th ed.)Oblepias, Virgilio R. Contraception by Surgery. New Day, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.