Kahls, R. L. (1967). Marketing of agricultural products (3rd ed.). Macmillan.
芝加哥风格引文Kahls, Richard Louis. Marketing of Agricultural Products. 3rd ed. New York: Macmillan, 1967.
MLA引文Kahls, Richard Louis. Marketing of Agricultural Products. 3rd ed. Macmillan, 1967.
警告：这些引文格式不一定是100％准确.