JOHNSON, P. &. o. BUSINESS ECONOMICS.
Lua i Stíl Chicago (17ú heag.)JOHNSON, P.A. & others. BUSINESS ECONOMICS.
Lua MLA (9ú heag.)JOHNSON, P.A. & others. BUSINESS ECONOMICS.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.