Johnson, E. S. (1956). Theory and practice of the social studies. Macmillan.
Čikaški stil citiranja (17. izdanje)Johnson, Earl Shepard. Theory and Practice of the Social Studies. New York: Macmillan, 1956.
MLA način citiranja (8. izdanje)Johnson, Earl Shepard. Theory and Practice of the Social Studies. Macmillan, 1956.
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