Cita APA (7a ed.)

Abraham, J. (1999). Enter at your own risk: HMO participation and enrollment in the Medicare risk market. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Abraham, Jean. Enter at Your Own Risk: HMO Participation and Enrollment in the Medicare Risk Market. Cambridge, MA: National Bureau of Economic Research, 1999.

Cita MLA (9a ed.)

Abraham, Jean. Enter at Your Own Risk: HMO Participation and Enrollment in the Medicare Risk Market. National Bureau of Economic Research, 1999.