Cita APA (7a ed.)

Goulder, L. H., & Williams, R. C. (1999). The usual excess-burden approximation usually doesn't come close. National Bureau of Economic Research.

Cita Chicago Style (17a ed.)

Goulder, Lawrence H., y Roberton C. Williams. The Usual Excess-burden Approximation Usually Doesn't Come Close. Cambridge, MA: National Bureau of Economic Research, 1999.

Cita MLA (9a ed.)

Goulder, Lawrence H., y Roberton C. Williams. The Usual Excess-burden Approximation Usually Doesn't Come Close. National Bureau of Economic Research, 1999.