Παραπομπή APA

Martorella, P. H. (1971). Concept learning in the social studies. Intext Educational Publishers.

Παραπομπή Chicago Style

Martorella, Peter H. Concept Learning in the Social Studies. London: Intext Educational Publishers, 1971.

Παραπομπή MLA

Martorella, Peter H. Concept Learning in the Social Studies. Intext Educational Publishers, 1971.