Παραπομπή APA

Malthus,T R. (1834). An Essay on the principle of population. Dent.

Παραπομπή Chicago Style

Malthus,T R. An Essay on the Principle of Population. London: Dent, 1834.

Παραπομπή MLA

Malthus,T R. An Essay on the Principle of Population. Dent, 1834.