Cita APA (7th ed.)

Friedman, M., & Friedman, R. D. (1980). Free to choose: A personal statement. Harcourt Brace Jovanovich.

Cita Chicago (17th ed.)

Friedman, Milton, i Rose D. Friedman. Free to Choose: A Personal Statement. New York: Harcourt Brace Jovanovich, 1980.

Cita MLA (9th ed.)

Friedman, Milton, i Rose D. Friedman. Free to Choose: A Personal Statement. Harcourt Brace Jovanovich, 1980.