M. . Ali Imron, H. . Teki Tjendani, and B. . Witjaksana, “Analysis of Factors Causing Variation Order In Construction Projects of PT. Tatamulia Nusantara Indah Surabaya Branch Office 2018-2022 Period”, devotion, vol. 3, no. 14, pp. 2695–2706, Dec. 2022.