M. Shah Habibullah, N. A. Sanusi, L. Abdullah, S. Kusairi, A. A. Golam Hassan, and N. Azura Ghazali, “DOES THE LESS DEVELOPED STATES IN MALAYSIA CATCHING-UP TO THE RICHER STATE OF SELANGOR?”, JCIT, vol. 8, pp. 29–40, Sep. 2018.