Dyfyniad APA

Malthus, T. R., & Pullen, J. E. (1989). Principles of political economy.

Dyfyniad Arddull Chicago

Malthus, T R., and John; Ed Pullen. Principles of Political Economy. Cambridge, CUP, 1989.

Dyfyniad MLA

Malthus, T R., and John; Ed Pullen. Principles of Political Economy. 1989.

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