MC GREGOR DOUGLAS. (1960). HUMANSIDE OF ENTERPRISE. MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)MC GREGOR DOUGLAS. HUMANSIDE OF ENTERPRISE. NEW YORK: MCGRAW-HILL, 1960.
Lua MLA (9ú heag.)MC GREGOR DOUGLAS. HUMANSIDE OF ENTERPRISE. MCGRAW-HILL, 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.