Dyfyniad APA

Anderson, G., Autier, P., Beral, V., Bosland, M., Fernández, E., Haslam, S., . . . Berthiller, J. (2007). Combined estrogen-progestogen contraceptives.

Dyfyniad Arddull Chicago

Anderson, G., et al. Combined Estrogen-progestogen Contraceptives. 2007.

Dyfyniad MLA

Anderson, G., et al. Combined Estrogen-progestogen Contraceptives. 2007.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.