CLIFTON H D. (1974). SYSTEMS ANALYSIS FOR BUSINESS DATA PROCESSING. PETROCELLI BOOKS.
Lua i Stíl Chicago (17ú heag.)CLIFTON H D. SYSTEMS ANALYSIS FOR BUSINESS DATA PROCESSING. NEW YORK: PETROCELLI BOOKS, 1974.
Lua MLA (9ú heag.)CLIFTON H D. SYSTEMS ANALYSIS FOR BUSINESS DATA PROCESSING. PETROCELLI BOOKS, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.