Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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