Dyfyniad APA

Beral, V., & Reeves, G. (1998). Breast cancer and combined oral contraceptives: Results from the Collaborative Group on Hormonal Factors in Breast Cancer.

Dyfyniad Arddull Chicago

Beral, V., and G. Reeves. Breast Cancer and Combined Oral Contraceptives: Results from the Collaborative Group on Hormonal Factors in Breast Cancer. 1998.

Dyfyniad MLA

Beral, V., and G. Reeves. Breast Cancer and Combined Oral Contraceptives: Results from the Collaborative Group on Hormonal Factors in Breast Cancer. 1998.

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