Posri, N., and P. Karuhadej. “The Outcome of Self-Efficacy Enhancement Program on Knowledge and Confidence in Physical Health Care of the Elderly for the Family Leaders Who Were Secondary School Students, Bangkok”. Vajira Medical Journal : Journal of Urban Medicine, vol. 66, no. 4, Aug. 2022, pp. 277-86, doi:10.14456/vmj.2022.28.