Thanh Loan, M., and and Nguyen Hoang Truc Quyen. “Factors Affecting Buying Decision On Voluntary Social Insurance in Vinh Long City in Vinh Long Province, Viet Nam”. British Journal of Marketing Studies, Vol. 8, no. 5, Aug. 2020, pp. 1-12, https://bjmsjournal.org/index.php/bjms/article/view/295.