Singhasem, P., K. Nawsuwan, and S. Suwanwaha. “Development of an Instructional Model to Enhance Gerontological Nursing Competencies Among Nursing Students”. Journal of Health Science of Thailand, vol. 28, no. Special Issue, June 2019, pp. 65-78, https://thaidj.org/index.php/JHS/article/view/6792.