“Analysis of Building Information Modeling (BIM) 4D-5D Method to Minimize the Occurrence of Variation Orders in Design and Build Contract Models”. International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695/IJERAT 9, no. 12 (December 16, 2023): 1–13. Accessed May 18, 2024. https://ijerat.com/index.php/ijerat/article/view/697.