Gega, P. C. (1994). Concepts and experiences in elementary school science (2nd ed.). Macmillan.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGega, Peter C. Concepts and Experiences in Elementary School Science. 2nd ed. New York: Macmillan, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGega, Peter C. Concepts and Experiences in Elementary School Science. 2nd ed. Macmillan, 1994.
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