Cita APA (7th ed.)

Berrington, A., Jha, P., Peto, J., Green, J., & Hermon, C. (2002). Oral contraceptives and cervical cancer.

Cita Chicago (17th ed.)

Berrington, A., P. Jha, J. Peto, J. Green, i C. Hermon. Oral Contraceptives and Cervical Cancer. 2002.

Cita MLA (9th ed.)

Berrington, A., et al. Oral Contraceptives and Cervical Cancer. 2002.