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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIPN Symposium, L. Hoffman, P. L. Gardner, Germany. Deutsche UNESCO- Kommission, Universitat Kiel. Institut fur die Padagogik der Naturwissenschaften, और Scientific and Cultural Organizations United Nations Educational. Interests in Science and Technology Education: 12th IPN Symposium. Kiel, Federal Republic of Germany: Institute for Science Education, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIPN Symposium, et al. Interests in Science and Technology Education: 12th IPN Symposium. Institute for Science Education, 1985.