Cita APA (7th ed.)
Bertrand, J. T., & Seiber, E. E. Contraceptive dynamics in Guatemala: 1978 - 1998.
Cita Chicago (17th ed.)
Bertrand, Jane T., i Eric Escudero Seiber. Contraceptive Dynamics in Guatemala: 1978 - 1998.
Cita MLA (9th ed.)
Bertrand, Jane T., i Eric Escudero Seiber. Contraceptive Dynamics in Guatemala: 1978 - 1998.
Atenció: Aquestes cites poden no estar 100% correctes.