Não informado. (1967). Journal of research and development in education. University of Georgia, College of Education.
Chicago-referens (17:e uppl.)Não informado. Journal of Research and Development in Education. Athens, Ga: University of Georgia, College of Education, 1967.
MLA-referens (8:e uppl.)Não informado. Journal of Research and Development in Education. University of Georgia, College of Education, 1967.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.