Sapuan, N. M., A. Abdullah, and N. H. Harun. “An Exploratory Study of Parental Savings for Higher Education”. The Journal of Muamalat and Islamic Finance Research, vol. 8, no. 1, Jan. 2011, pp. 31-48, https://jmifr.usim.edu.my/index.php/jmifr/article/view/130.