Mohd Isa, Nor Nabilah Fatin, and Nurazwa Ahmad. “Kepuasan Pelanggan Terhadap Kualiti Perkhidmatan Pos Malaysia Dan Gdex Di Skudai”. Research in Management of Technology and Business, vol. 2, no. 1, June 2021, pp. 137-52, https://penerbit.uthm.edu.my/periodicals/index.php/rmtb/article/view/1987.