Mohamed, Zulkifley, and Kamarulzaman Ibrahim. 2009. “Pembolehubah Pendam Teguh Dalam Model Persamaan Berstruktur Kuasa Dua Terkecil Separa: Robust Latent Variables in The Partial Least Squares Structural Equation Model”. Journal of Science and Mathematics Letters 1 (1):45-58. https://ojs.upsi.edu.my/index.php/JSML/article/view/326.