Epp, D. J. (1981). Introduction to agricultural economics. New York: Collier Macmillan.
Trích dẫn kiểu ChicagoEpp, Donald J. Introduction to Agricultural Economics. New York: Collier Macmillan, 1981.
MLA引文Epp, Donald J. Introduction to Agricultural Economics. New York: Collier Macmillan, 1981.
警告：這些引文格式不一定是100％准確.