Citazione APA

Kownslar, A. O., & Frizzle, D. B. (1974). Discovering American history. Holt, Rinehart and Winston.

Stile di citazione Chicago

Kownslar, Allan O., e Donald B. Frizzle. Discovering American History. New York: Holt, Rinehart and Winston, 1974.

Citazione MLA

Kownslar, Allan O., e Donald B. Frizzle. Discovering American History. Holt, Rinehart and Winston, 1974.