Anderson, G., Autier, P., Beral, V., Bosland, M., Fernández, E., Haslam, S., . . . Berthiller, J. (2007). Combined estrogen-progestogen contraceptives.
Cita Chicago Style (17a ed.)Anderson, G., et al. Combined Estrogen-progestogen Contraceptives. 2007.
Cita MLA (9a ed.)Anderson, G., et al. Combined Estrogen-progestogen Contraceptives. 2007.
Precaución: Estas citas no son 100% exactas.