Friedman, M. (1980). Free to choose: A personal statement. New York: Avon.
Trích dẫn kiểu ChicagoFriedman, Milton. Free to Choose: A Personal Statement. New York: Avon, 1980.
MLA引文Friedman, Milton. Free to Choose: A Personal Statement. New York: Avon, 1980.
警告：这些引文格式不一定是100％准确.