Perry, M. (1990). Western civilization: A brief survey. Houghton Mifflin Company.
Lua i Stíl Chicago (17ú heag.)Perry, Marvin. Western Civilization: A Brief Survey. Dallas Geneva: Houghton Mifflin Company, 1990.
Lua MLA (9ú heag.)Perry, Marvin. Western Civilization: A Brief Survey. Houghton Mifflin Company, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.