Preston, R. C. (1968). Teaching social studies in the elementary school (3d ed.). Rinehart and Winston.
Citace podle Chicago (17th ed.)Preston, Ralph Clausius. Teaching Social Studies in the Elementary School. 3d ed. New York: Rinehart and Winston, 1968.
Citace podle MLA (9th ed.)Preston, Ralph Clausius. Teaching Social Studies in the Elementary School. 3d ed. Rinehart and Winston, 1968.
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