APA aipamena

Singh, S., & Wulf, D. H. (2009). Abortion worldwide: A decade of uneven progress.

Chicago Style aipamena

Singh, Susheela, and Deirdre Hussain Wulf. Abortion Worldwide: A Decade of Uneven Progress. 2009.

MLA aipamena

Singh, Susheela, and Deirdre Hussain Wulf. Abortion Worldwide: A Decade of Uneven Progress. 2009.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.