Chongkonsatit, W., N. Wongsinphaibon, A. Kurupakorn, K. Urairoekkun, and K. Noimanee. “7Cs marketing mix factors in a dental school comprehensive care clinic: A confirmatory factor analysis”. Mahidol Dental Journal, vol. 42, no. 1, Mar. 2022, pp. 13-24, https://he02.tci-thaijo.org/index.php/mdentjournal/article/view/253769.