SIMPSON ALAN. (1989). UNDERSTANDING DBASE IV. BPB PUBLICATIONS.
芝加哥风格引文SIMPSON ALAN. UNDERSTANDING DBASE IV. DELHI: BPB PUBLICATIONS, 1989.
MLA引文SIMPSON ALAN. UNDERSTANDING DBASE IV. BPB PUBLICATIONS, 1989.
警告：这些引文格式不一定是100％准确.
APA引文