PURCHALL, F. (1972). Case Studies In Business Data Processing F.w.purchall And Raymond S. Walker. MacMilan Press Ltd.
Lua i Stíl Chicago (17ú heag.)PURCHALL, F.W. Case Studies In Business Data Processing F.w.purchall And Raymond S. Walker. MacMilan Press Ltd, 1972.
Lua MLA (8ú heag.)PURCHALL, F.W. Case Studies In Business Data Processing F.w.purchall And Raymond S. Walker. MacMilan Press Ltd, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.