APA-viite (7. p.)

Perez, E. J. (1970). Conceptual approach in the teaching of social studies in elementary school.

Chicago-viite (17. p.)

Perez, Efigenia J. Conceptual Approach in the Teaching of Social Studies in Elementary School. 1970.

MLA-viite (9. p.)

Perez, Efigenia J. Conceptual Approach in the Teaching of Social Studies in Elementary School. 1970.

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