Heidt, E. U. (1978). Instructional media and the individual learner: A classification and systems appraisal (Rev. and enl. English ed.). Kagan Page.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHeidt, Erhard U. Instructional Media and the Individual Learner: A Classification and Systems Appraisal. Rev. and enl. English ed. London: Kagan Page, 1978.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHeidt, Erhard U. Instructional Media and the Individual Learner: A Classification and Systems Appraisal. Rev. and enl. English ed. Kagan Page, 1978.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.