Kessler, C. (1993). International Scientific Cooperation, Consolidated report of activities, 1987 - 90.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKessler, C. International Scientific Cooperation, Consolidated Report of Activities, 1987 - 90. 1993.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKessler, C. International Scientific Cooperation, Consolidated Report of Activities, 1987 - 90. 1993.
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