Perry, J. S. (1996). Understanding our planet: An overview of the major scientific activities of ICSU and its partners that address global environmental change (Second edition.). International Council of Scientific Unions.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPerry, John S. Understanding Our Planet: An Overview of the Major Scientific Activities of ICSU and Its Partners That Address Global Environmental Change. Second edition. Paris, France: International Council of Scientific Unions, 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPerry, John S. Understanding Our Planet: An Overview of the Major Scientific Activities of ICSU and Its Partners That Address Global Environmental Change. Second edition. International Council of Scientific Unions, 1996.
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