WIEDERHOLD GIO. (1977). DATABASE DESIGN. MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)WIEDERHOLD GIO. DATABASE DESIGN. AUCKLAND: MCGRAW-HILL, 1977.
Lua MLA (9ú heag.)WIEDERHOLD GIO. DATABASE DESIGN. MCGRAW-HILL, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.