Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.