Van, Luu Truong, et al. “Identifying Causes of Material Wastage on Construction Sites in Vietnam”. HO CHI MINH CITY OPEN UNIVERSITY JOURNAL OF SCIENCE - ENGINEERING AND TECHNOLOGY, vol. 1, no. 1, Mar. 2011, pp. 3-9, https://journalofscience.ou.edu.vn/index.php/tech-en/article/view/372.