Heidt, E. U. (1978). Instructional media and the individual learner: A classification and systems appraisal (Rev. and enl. English ed.). Kagan Page.
Chicago-referens (17:e uppl.)Heidt, Erhard U. Instructional Media and the Individual Learner: A Classification and Systems Appraisal. Rev. and enl. English ed. London: Kagan Page, 1978.
MLA-referens (8:e uppl.)Heidt, Erhard U. Instructional Media and the Individual Learner: A Classification and Systems Appraisal. Rev. and enl. English ed. Kagan Page, 1978.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.