APA-referens

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

Chicago-stil citat

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

MLA-referens

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