Cita APA

Travis, R., & Key, T. (2003). Oestrogen exposure and breast cancer risk.

Citación estilo Chicago

Travis, R., and T. Key. Oestrogen Exposure and Breast Cancer Risk. 2003.

Cita MLA

Travis, R., and T. Key. Oestrogen Exposure and Breast Cancer Risk. 2003.

Warning: These citations may not always be 100% accurate.