APA

Hoffmann H., Moore C., Zimmermann H., Elger W., Schwarz S., Gräser T. & Oettel M. (19981218). Approaches to the replacement of ethinylestradiol by natural 17beta-estradiol in combined oral contraceptives. : Experimental and toxicologic pathology : official journal of the Gesellschaft fur Toxikologische Pathologie.

Chicago

Hoffmann H, Moore C, Zimmermann H, Elger W, Schwarz S, Gräser T and Oettel M. 19981218. Approaches to the replacement of ethinylestradiol by natural 17beta-estradiol in combined oral contraceptives. : Experimental and toxicologic pathology : official journal of the Gesellschaft fur Toxikologische Pathologie.

Harvard

Hoffmann H., Moore C., Zimmermann H., Elger W., Schwarz S., Gräser T. and Oettel M. (19981218). Approaches to the replacement of ethinylestradiol by natural 17beta-estradiol in combined oral contraceptives. : Experimental and toxicologic pathology : official journal of the Gesellschaft fur Toxikologische Pathologie.

MLA

Hoffmann H, Moore C, Zimmermann H, Elger W, Schwarz S, Gräser T and Oettel M. Approaches to the replacement of ethinylestradiol by natural 17beta-estradiol in combined oral contraceptives. : Experimental and toxicologic pathology : official journal of the Gesellschaft fur Toxikologische Pathologie. 19981218.