Malthus, T. (1960). On population. Random House.
Lua i Stíl Chicago (17ú heag.)Malthus, Thomas. On Population. New York: Random House, 1960.
Lua MLA (9ú heag.)Malthus, Thomas. On Population. Random House, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.