SIEGEL CHARLES. (1990). MASTERING FOXPRO: WITH FASTTRACK SPEED NDTCO. BPB PUBLICATIONS.
芝加哥风格引文SIEGEL CHARLES. MASTERING FOXPRO: WITH FASTTRACK SPEED NDTCO. NEW DELHI: BPB PUBLICATIONS, 1990.
MLA引文SIEGEL CHARLES. MASTERING FOXPRO: WITH FASTTRACK SPEED NDTCO. BPB PUBLICATIONS, 1990.
警告：这些引文格式不一定是100％准确.