Gega, P. C., Gega, P. C. S. i. e. e., & Gega, P. C. C. a. e. i. e. s. s. (1994). How to teach elementary school science (2nd ed.). Macmillan.
Cita Chicago Style (17a ed.)Gega, Peter C., Peter C. Science in elementary education Gega, y Peter C. Concepts and experiences in elementary school science Gega. How to Teach Elementary School Science. 2nd ed. New York: Macmillan, 1994.
Cita MLA (9a ed.)Gega, Peter C., et al. How to Teach Elementary School Science. 2nd ed. Macmillan, 1994.
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