Cita APA (7a ed.)

Gruber, J., Levine, P., & Staiger, D. (1997). Abortion Legalization and Child Living Circumstances: Who is the Marginal Child? National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Gruber, Jonathan, Phillip Levine, y Douglas Staiger. Abortion Legalization and Child Living Circumstances: Who Is the Marginal Child? Cambridge, Massachusetts: National Bureau of Economic Research, 1997.

Cita MLA (9a ed.)

Gruber, Jonathan, et al. Abortion Legalization and Child Living Circumstances: Who Is the Marginal Child? National Bureau of Economic Research, 1997.