Nardo, D. (1991). Population. Lucent Books.
Lua i Stíl Chicago (17ú heag.)Nardo, Don. Population. San Diego, CA: Lucent Books, 1991.
Lua MLA (8ú heag.)Nardo, Don. Population. Lucent Books, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.