Cita APA (7a ed.)

Friedman, M., & Friedman, R. D. (1990). Free to choose: A personal statement (1st Harvest ed.). Harcourt.

Cita Chicago Style (17a ed.)

Friedman, Milton, y Rose D. Friedman. Free to Choose: A Personal Statement. 1st Harvest ed. San Diego [etc.]: Harcourt, 1990.

Cita MLA (9a ed.)

Friedman, Milton, y Rose D. Friedman. Free to Choose: A Personal Statement. 1st Harvest ed. Harcourt, 1990.