Barkley, P. W. (1977). Economics: The way we choose. Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)Barkley, Paul W. Economics: The Way We Choose. New York: Harcourt Brace Jovanovich, 1977.
Lua MLA (9ú heag.)Barkley, Paul W. Economics: The Way We Choose. Harcourt Brace Jovanovich, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.