Hass, K. (1969). Creative salesmanship understanding essentials. George Press.
芝加哥风格引文Hass, K. Creative Salesmanship Understanding Essentials. London: George Press, 1969.
MLA引文Hass, K. Creative Salesmanship Understanding Essentials. George Press, 1969.
警告：这些引文格式不一定是100％准确.