Hyman, D. N. (1992). Economics (2nd ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Hyman, David N. Economics. 2nd ed. Homewood: Irwin, 1992.
Lua MLA (9ú heag.)Hyman, David N. Economics. 2nd ed. Irwin, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.