Lua APA (7ú heag.)

Levine, P. B., & Staiger, D. (2001). Abortion as insurance. National Bureau of Economic Research.

Lua i Stíl Chicago (17ú heag.)

Levine, Phillip B., agus Douglas Staiger. Abortion as Insurance. Cambridge: National Bureau of Economic Research, 2001.

Lua MLA (9ú heag.)

Levine, Phillip B., agus Douglas Staiger. Abortion as Insurance. National Bureau of Economic Research, 2001.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.