Citazione Stile APA (7a Edizione)

Preston, R. C. (1968). Teaching social studies in the elementary school (3d ed.). Rinehart and Winston.

Citazione stile Chigago Style (17a edizione)

Preston, Ralph Clausius. Teaching Social Studies in the Elementary School. 3d ed. New York: Rinehart and Winston, 1968.

Citatione MLA (9a ed.)

Preston, Ralph Clausius. Teaching Social Studies in the Elementary School. 3d ed. Rinehart and Winston, 1968.