Ghazali, M. A. A., N. F. Bahardin, M. A. Zaidi, M. N. Baharuddin, and M. R. Yusof. “Literature Mapping: Critical Factors in IBS Plastic Formwork Application”. International Review of Management and Marketing, vol. 6, no. 7S, Oct. 2016, pp. 204-8, https://www.econjournals.com/index.php/irmm/article/view/3254.