Perez, E. J. (1970). Conceptual approach in the teaching of social studies in elementary school.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPerez, Efigenia J. Conceptual Approach in the Teaching of Social Studies in Elementary School. 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPerez, Efigenia J. Conceptual Approach in the Teaching of Social Studies in Elementary School. 1970.
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