Friedman, M., & Friedman, R. D. (1980). Free to choose: A personal statement. Harcourt Brace Jovanovich.
芝加哥风格引文Friedman, Milton, 与 Rose D. Friedman. Free to Choose: A Personal Statement. New York: Harcourt Brace Jovanovich, 1980.
MLA引文Friedman, Milton, 与 Rose D. Friedman. Free to Choose: A Personal Statement. Harcourt Brace Jovanovich, 1980.
警告：这些引文格式不一定是100％准确.