SIMPSON ALAN. (1986). UNDERSTANDING DBASE 111 PLUS. BPB PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)SIMPSON ALAN. UNDERSTANDING DBASE 111 PLUS. DELHI: BPB PUBLICATIONS, 1986.
Lua MLA (9ú heag.)SIMPSON ALAN. UNDERSTANDING DBASE 111 PLUS. BPB PUBLICATIONS, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.