Cita APA

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

Chicago Edition Citation

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

Cita MLA

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