Cita APA (7a ed.)

Malthus, T. R., & Gilbert, G. (1993). An essay on the principle of population (1st published as a World's Classics paperback.). Oxford University Press.

Cita Chicago Style (17a ed.)

Malthus, Thomas Robert, y Geoffrey Gilbert. An Essay on the Principle of Population. 1st published as a World's Classics paperback. Oxford [etc.]: Oxford University Press, 1993.

Cita MLA (9a ed.)

Malthus, Thomas Robert, y Geoffrey Gilbert. An Essay on the Principle of Population. 1st published as a World's Classics paperback. Oxford University Press, 1993.