APA (7th ed.) Citation

Malthus, T. R. (1999). An Essay on the principle of population. Oxford University Press.

Chicago Style (17th ed.) Citation

Malthus, T. R. An Essay on the Principle of Population. Oxford: Oxford University Press, 1999.

MLA (9th ed.) Citation

Malthus, T. R. An Essay on the Principle of Population. Oxford University Press, 1999.

Warning: These citations may not always be 100% accurate.