Cita APA (7th ed.)

Friedman, M., & Friedman, R. (1990). Free to choose: A personal statement. Pan Books.

Cita Chicago (17th ed.)

Friedman, Milton, i Rose Friedman. Free to Choose: A Personal Statement. London: Pan Books, 1990.

Cita MLA (9th ed.)

Friedman, Milton, i Rose Friedman. Free to Choose: A Personal Statement. Pan Books, 1990.