Friedman, M., & Friedman, R. D. (1990). Free to choose: A personal statement (First Harvest/HBJ edition.). Harcourt Brace Jovanovich.
Lua i Stíl Chicago (17ú heag.)Friedman, Milton, agus Rose D. Friedman. Free to Choose: A Personal Statement. First Harvest/HBJ edition. San Diego: Harcourt Brace Jovanovich, 1990.
Lua MLA (8ú heag.)Friedman, Milton, agus Rose D. Friedman. Free to Choose: A Personal Statement. First Harvest/HBJ edition. Harcourt Brace Jovanovich, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.