Laibson, D., & Tobacman, J. (2000). A debt puzzle. National Bureau of Economic Research.
Lua i Stíl Chicago (17ú heag.)Laibson, David, agus Jeremy Tobacman. A Debt Puzzle. Cambridge: National Bureau of Economic Research, 2000.
Lua MLA (9ú heag.)Laibson, David, agus Jeremy Tobacman. A Debt Puzzle. National Bureau of Economic Research, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.