CHEN, W., TAN, N. Y. L., LOOI, C.-K., ZHANG, B. and SEOW, P. S. K. (2008) “HANDHELD COMPUTERS AS COGNITIVE TOOLS: TECHNOLOGY-ENHANCED ENVIRONMENTAL LEARNING”, Research and Practice in Technology Enhanced Learning, 3(3), pp. 231–252. doi: 10.58459/rptel.2008.3231-252.