APA引文

Spence, R. (1989). Clipper programming guide. Microtrend Books.

芝加哥风格引文

Spence, Rick. Clipper Programming Guide. San Marcos, CA: Microtrend Books, 1989.

MLA引文

Spence, Rick. Clipper Programming Guide. Microtrend Books, 1989.

警告：这些引文格式不一定是100％准确.