Hyman, D. N. (1994). Economics (3rd ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Hyman, David N. Economics. 3rd ed. Burr Ridge, Ill.: Irwin, 1994.
Lua MLA (8ú heag.)Hyman, David N. Economics. 3rd ed. Irwin, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.