1. Arain, F. M., & Pheng, L. S. (2005). The potential effects of variation orders on institutional building projects. Facilities, 23(11–12), 496–510.https://doi.org/10.1108/02632770510618462
2. Arain, F. M., & Pheng, L. S. (2006). Developers’ views of potential causes of variation orders for institutional buildings in singapore. Architectural Science Review, 49(1), 59–74. https://doi.org/10.3763/asre.2006.4908
3. Keane, P., Sertyesilisik, B., & Ross, A. D. (2010). Variations and Change Orders on Construction Projects. Journal of Legal Affairs and Dispute Resolution in Engineering and Construction, 2(2), 89–96. https://doi.org/10.1061/(asce)la.1943-4170.0000016
4. Khan, R. A., Liew, M. S., & Ghazali, Z. Bin. (2014). Malaysian Construction Sector and Malaysia Vision 2020: Developed Nation Status. Procedia - Social and Behavioral Sciences, 109, 507–513. https://doi.org/10.1016/j.sbspro.2013.12.498
5. Klee, L. (2018). International Construction Contract Law (2nd ed.). John Wiley Sons Ltd. https://doi.org/10.1002/9781118717868
6. Mahamid, I. (2017). Effect of change orders on rework in highway projects in Palestine. Journal of Financial Management of Property and Construction, 22(1), 62–76. https://doi.org/10.1108/JFMPC-03-2016-0015
7. Megat, S. A., Arbi, E., & Keumala, N. (2016). Historiography of mosque architecture in Malaysia: Analysis of texts by 5 authors. Journal of Design and Built Environment, 16(2), 44–54. https://doi.org/10.22452/jdbe.vol16no2.1
8. Memon, Aftab Hamed, Rahman, I. A., & Jamil, M. H. A. (2014). Severity of Variation Order Factors in affecting Construction Project Performance. Journal of Basic and Applied Scietific Research, 4(6), 19–27.
9. Memon, Aftab Hameed, Rahman, I. A., & Hasan, M. F. A. (2014). Significant causes and effects of variation orders in construction projects. Research Journal of Applied Sciences, Engineering and Technology, 7(21), 4494–4502. https://doi.org/10.19026/rjaset.7.826
10. Mohammad, N., Ani, A. I. C., Rakmat, A. A. O. K., & Yusof, M. A. (2010). Investigation on the Causes of Variation Orders in the Construction of Building Project – a Study in the State of Selangor, Malaysia. Journal of Building Performance, 1(1), 73–82.
11. Mohammad, Noraziah, & Hamzah, Z. (2019). A review of causes of variation order in the construction of terrace housing projects in Malaysia. MATEC Web of Conferences, 277, 03013. https://doi.org/10.1051/matecconf/201927703013
12. Muhammad, N. Z., Keyvanfar, A., Abd Majid, M. Z., Shafagat, A., Magana, A. M., & Dankaka, N. S. (2015). Causes of Variation Order in Building and Civil Engineering Project in Nigeria. Jurnal Teknologi, 77:16, 91–97.
13. Muhammad, N. Z., Keyvanfar, A., Majid, M. Z. A., Shafaghat, A., Magana, A. M., & Dankaka, N. S. (2015). Causes of variation order in building and civil engineering projectsin Nigeria. Jurnal Teknologi, 77(16), 91–97. https://doi.org/10.11113/jt.v77.6404
14. Mustapha, Z., Akomah, B. B., Mensah, J. W., & Kottey, S. (2018). Cost impacts of variations on building construction projects. MOJ Civil Engineering, 4(5), 403–408. https://doi.org/10.15406/mojce.2018.04.00133
15. Ndihokubwayo, R. (2008). An Analysis Of The Impact Of Variation Orders On Project Performance. Cape Peninsula University of Technology.
16. Obagboye, Hellen, O., Ariffin, H. L. T., Williams, & Samuel, O. (2019). Implications of Contractual Variation Orders on Building Construction Projects. International Journal of Advanced Research in Science, Engineering and Technology, 6(9), 10764–10773.
17. Pokharel, A. R., & Joshi, B. R. (2020). Impact of Variation Orders on Construction Project Cost: A case study of Land Pooling Project at Kathmandu of Ichangu Narayan, Nepal. Saudi Journal of Engineering and Technology, 05(05), 203–230. https://doi.org/10.36348/sjet.2020.v05i05.003
18. Smith, W. (2016). The Effect of Variation Orders on Project Cost and Schedule Overruns. In Journal of Project Management (Vol. 5, Issue 2). www.pmi.org