มนสัจจกุล พ., and วรวงศ์ จ. “The Application of a Phenomenographic Approach in Healthcare and Nursing Research”. Nursing Journal of The Ministry of Public Health, vol. 28, no. 2, Sept. 2018, pp. 11-26, https://he02.tci-thaijo.org/index.php/tnaph/article/view/144718.