Cita APA (7a ed.)

Bound, J., & Solon, G. (1998). Double trouble: On the value of twins-based estimation of the return to schooling. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Bound, John, y Gary Solon. Double Trouble: On the Value of Twins-based Estimation of the Return to Schooling. Cambridge, MA: National Bureau of Economic Research, 1998.

Cita MLA (9a ed.)

Bound, John, y Gary Solon. Double Trouble: On the Value of Twins-based Estimation of the Return to Schooling. National Bureau of Economic Research, 1998.