SIMPSON ALAN. (1993). UNDERSTANDING DBASE III PLUS. BPB.
Lua i Stíl Chicago (17ú heag.)SIMPSON ALAN. UNDERSTANDING DBASE III PLUS. NEW DELHI: BPB, 1993.
Lua MLA (9ú heag.)SIMPSON ALAN. UNDERSTANDING DBASE III PLUS. BPB, 1993.
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