Cita APA

Malthus, T., & Pullen, J. (1989). Principles of Political Economy. Cambridge University Press.

Citación estilo Chicago

Malthus, T.R, y John Pullen. Principles of Political Economy. Cambridge: Cambridge University Press, 1989.

Cita MLA

Malthus, T.R, y John Pullen. Principles of Political Economy. Cambridge University Press, 1989.