SIMPSON ALAN. (1988). DBASE INSTANT REFERENCE. BPB PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)SIMPSON ALAN. DBASE INSTANT REFERENCE. NEW DELHI: BPB PUBLICATIONS, 1988.
Lua MLA (9ú heag.)SIMPSON ALAN. DBASE INSTANT REFERENCE. BPB PUBLICATIONS, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.