Hogan, K. 1994. Eco-Inquiry: A guide to ecological learning experiences for the upper elementary/middle grades. Kendall-Hunt, Dubuque, IA. Matthew Kloser and Sophia Grathwol (2018) Reading Nature: Engaging Biology Students With Evidence From the Living World. NSTA Press Korfiatis K. & St. Paraskevopoulos (2010). General Principles of Ecology, Disigma Editions, Athens, Greece, pp. 191. Allen, Michael (2016) The best ways to teach Primary Science: research into practice. Maidenhead, U.K. : Open University Press. Warren, Patricia, and Janet R. Galle (2005). Exploring ecology : 49 ready- to-use activities for grades 4-8. NSTA Press. Paraskevopoulos S., & K. Korfiatis (2003). Environmental Education: Theories and Methods (textbook), Thessaloniki, Christodoulides eds, pp. 186.
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