Cita APA (7th ed.)

Laibson, D., & Tobacman, J. (2000). A debt puzzle. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Laibson, David, i Jeremy Tobacman. A Debt Puzzle. Cambridge: National Bureau of Economic Research, 2000.

Cita MLA (9th ed.)

Laibson, David, i Jeremy Tobacman. A Debt Puzzle. National Bureau of Economic Research, 2000.