APA引文

Sapsford,David, & Ladd,James. (1978). Essential economics. Hart-Davis Educational.

Chicago Edition Citation

Sapsford,David, and Ladd,James. Essential Economics. Great Britain: Hart-Davis Educational, 1978.

MLA引文

Sapsford,David, and Ladd,James. Essential Economics. Hart-Davis Educational, 1978.

警告：這些引文格式不一定是100％准確.