Mohamed, Z., and R. Rosli. “Development of A Structural Model With Multicollinearity and Outliers Problems: Pembangunan Model Berstruktur Bermasalah Multikolinearan Dan Data Pencilan”. EDUCATUM Journal of Science, Mathematics and Technology, vol. 1, no. 1, June 2014, pp. 38-52, https://ojs.upsi.edu.my/index.php/EJSMT/article/view/9.