Malthus, T. R., & Gilbert, G. (2008). An essay on the principle of population. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Malthus, T. R., agus Geoffrey Gilbert. An Essay on the Principle of Population. Oxford ; New York: Oxford University Press, 2008.
Lua MLA (8ú heag.)Malthus, T. R., agus Geoffrey Gilbert. An Essay on the Principle of Population. Oxford University Press, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.