APA (7e ed.) Bronvermelding

Friedman, M., & Friedman, R. D. (1990). Free to choose: A personal statement (First Harvest/HBJ edition.). Harcourt Brace Jovanovich.

Chicago (17e ed.) Bronvermelding

Friedman, Milton, en Rose D. Friedman. Free to Choose: A Personal Statement. First Harvest/HBJ edition. San Diego: Harcourt Brace Jovanovich, 1990.

MLA (8e ed.) Bronvermelding

Friedman, Milton, en Rose D. Friedman. Free to Choose: A Personal Statement. First Harvest/HBJ edition. Harcourt Brace Jovanovich, 1990.