Thomas, S. (1980). The developed world. Bell & Hymn.
Lua i Stíl Chicago (17ú heag.)Thomas, Spencer. The Developed World. London: Bell & Hymn, 1980.
Lua MLA (9ú heag.)Thomas, Spencer. The Developed World. Bell & Hymn, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.