Heba, H, I., Saadia, A. F., W. I, O. (2016). 'A PROPOSED UNIT IN PSYCHOLOGY COURSE BASED ON THE SOCIAL CONSTRUCTIVISM THEORY OF VYGOTSKY FOR DEVELOPMENT ENVIRONMENTAL CONCEPTS AND ATTITUDES FOR GRADE TWO SECONDARY STAGE STUDENT', Journal of Environmental Science, 35(2), pp. 517-549. doi: 10.21608/jes.2016.28062