Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Friedman, Milton, y Rose D. Friedman. Free to Choose: A Personal Statement. San Diego [etc.]: Harcourt Brace Jovanovich, 1980.

Cita MLA (9a ed.)

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