Peterson, W. C. (1973). Elements of economics. Norton.
Lua i Stíl Chicago (17ú heag.)Peterson, Wallace C. Elements of Economics. New York: Norton, 1973.
Lua MLA (9ú heag.)Peterson, Wallace C. Elements of Economics. Norton, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.