APA (7th ed.) Citation

Malthus, T. R. (1973). An essay on the principle of population. J. M. Dent.

Chicago Style (17th ed.) Citation

Malthus, T. R. An Essay on the Principle of Population. London: J. M. Dent, 1973.

MLA (9th ed.) Citation

Malthus, T. R. An Essay on the Principle of Population. J. M. Dent, 1973.