Yusuf, M., M. Y. M. Mai, and M. Salih. “Gender Differences in Perceptions of Grandchildren towards Grandparent Nurturing”. International Review of Management and Marketing, vol. 6, no. 4S, May 2016, pp. 185-9, https://www.econjournals.com/index.php/irmm/article/view/2485.