Não informado. (1976). Population. Population Crisis Committee.
Lua i Stíl Chicago (17ú heag.)Não informado. Population. Washington: Population Crisis Committee, 1976.
Lua MLA (8ú heag.)Não informado. Population. Population Crisis Committee, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.