(1965). Population Problems / Warren S. Thompson, David T. Lewis. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Population Problems / Warren S. Thompson, David T. Lewis. McGraw-Hill, 1965.
Lua MLA (8ú heag.)Population Problems / Warren S. Thompson, David T. Lewis. McGraw-Hill, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.