Gaya APA

Ploghoft, M, E., H., I, S, A. (1971). Social science education in the elementary school . Ohio: Ohio: Charles E. Merrill; 1971.

Gaya MLA

Ploghoft, Milton, E.., H., I., Shuster,, Albert. "Social science education in the elementary school". Ohio: Ohio: Charles E. Merrill; 1971, 1971. Text.