Petchdakul, N., and A. Angsuthornvilai. “Consumption Behavior and Characteristics of Male Consumers Regarding High-Calcium Milk Products in Bangkok”. Kasetsart Journal of Social Sciences, vol. 30, no. 3, Dec. 2009, pp. 292-0, https://so04.tci-thaijo.org/index.php/kjss/article/view/246570.