Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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