NARDHANS WILLIAM D. (1989). ECONOMICS (13.). MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)NARDHANS WILLIAM D. ECONOMICS. 13. MCGRAW-HILL BK.CO: MCGRAW-HILL, 1989.
Lua MLA (9ú heag.)NARDHANS WILLIAM D. ECONOMICS. 13. MCGRAW-HILL, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.