Feier, R. (1930). Elements of economics. College entrance book co..
Lua i Stíl Chicago (17ú heag.)Feier, Richard. Elements of Economics. New York: College entrance book co., 1930.
Lua MLA (8ú heag.)Feier, Richard. Elements of Economics. College entrance book co., 1930.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.