Samuelson, P. A., & Samuelson, W. (1980). Economics (11th ed.). McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Samuelson, Paul Anthony, agus William Samuelson. Economics. 11th ed. New York: McGraw-Hill, 1980.
Lua MLA (8ú heag.)Samuelson, Paul Anthony, agus William Samuelson. Economics. 11th ed. McGraw-Hill, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.