Mandino, O. (1968). The greatest salesman in the world. Frederick Fell.
芝加哥风格引文Mandino, Og. The Greatest Salesman in the World. New York: Frederick Fell, 1968.
MLA引文Mandino, Og. The Greatest Salesman in the World. Frederick Fell, 1968.
警告：这些引文格式不一定是100％准确.