Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.