Kelsall, R. K. (1967). Population. Longmans.
Lua i Stíl Chicago (17ú heag.)Kelsall, R. Keith. Population. [London]: Longmans, 1967.
Lua MLA (8ú heag.)Kelsall, R. Keith. Population. Longmans, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.