สุวรรณช., and ทองแป้นร. “An Elderly Population Database Development With the GIS Application:: A Case of Nam-Jo Municipality, Mae-Tha District, Lampang Province”. Journal of Graduate Research, Vol. 10, no. 1, June 2019, pp. 219-34, https://so02.tci-thaijo.org/index.php/banditvijai/article/view/183673.