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