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.
Deismireacht MLAFriedman, Milton. Free to Choose: A Personal Statement. New York: Avon, 1980.
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