Friedman, M., & Friedman, R. (1990). Free to choose: A personal statement. Pan Books.
芝加哥风格引文Friedman, Milton, 与 Rose Friedman. Free to Choose: A Personal Statement. London: Pan Books, 1990.
MLA引文Friedman, Milton, 与 Rose Friedman. Free to Choose: A Personal Statement. Pan Books, 1990.
警告：这些引文格式不一定是100％准确.