Witjaksana, Budi. “Activity Based Management Change Order Model-Based Economic Value Added Through The Effectiveness And Efficiency To Improve The Financial Performance Of Building Construction Projects In Surabaya City”. Archives of Business Research 7, no. 2 (February 17, 2019): 153–170. Accessed November 13, 2024. http://116.203.177.230/index.php/ABR/article/view/6201.