Dao, T.-L. ., N.-G. . Nguyen, and T. . Tran. “Designing, Building and Using Interactive E-Textbooks According to the Organization of Discovery Learning Acts in Vietnam”. International Journal of Learning, Teaching and Educational Research, vol. 15, no. 10, Sept. 2016, pp. 38-61, http://www.ijlter.myres.net/index.php/ijlter/article/view/881.