Não informado. (1967). Journal of research and development in education. University of Georgia, College of Education.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of Research and Development in Education. Athens, Ga: University of Georgia, College of Education, 1967.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of Research and Development in Education. University of Georgia, College of Education, 1967.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.