Cita APA (7th ed.)

Bradford, D. F., & Shaviro, D. N. (1999). The economics of vouchers. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Bradford, David F., i Daniel N. Shaviro. The Economics of Vouchers. Cambridge: National Bureau of Economic Research, 1999.

Cita MLA (9th ed.)

Bradford, David F., i Daniel N. Shaviro. The Economics of Vouchers. National Bureau of Economic Research, 1999.