Perez, E. J. (1970). Conceptual approach in the teaching of social studies in elementary school.
Čikaški stil citiranja (17. izdanje)Perez, Efigenia J. Conceptual Approach in the Teaching of Social Studies in Elementary School. 1970.
MLA način citiranja (9. izdanje)Perez, Efigenia J. Conceptual Approach in the Teaching of Social Studies in Elementary School. 1970.
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