Sharma, Kavita, and Leisangthem Binita Devi. “Teaching-Learning in EVS through Integrated Approach in Early Grades Perceptions and Awareness of Teachers”. JOURNAL OF INDIAN EDUCATION, vol. 38, no. 2, Aug. 2012, pp. p. 102-112, http://14.139.250.109:8090/index.php/jie/article/view/1115.