Dyfyniad APA

Cropper, M. L., & Laibson, D. I. (1998). The implications of hyperbolic discounting for project evaluation. World Bank.

Dyfyniad Arddull Chicago

Cropper, Maureen L., and David I. Laibson. The Implications of Hyperbolic Discounting for Project Evaluation. Washington, DC: World Bank, 1998.

Dyfyniad MLA

Cropper, Maureen L., and David I. Laibson. The Implications of Hyperbolic Discounting for Project Evaluation. World Bank, 1998.

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