Ployngoen, Kanlaya, Bualuang Sumdaengrit, and Tiraporn Junda. “Knowledge and Attitudes Toward Advance Directive among Patients with Chronic Illness and Relatives”. Nursing Research and Innovation Journal 32, no. 1 (April 29, 2026). accessed September 18, 2026. https://he02.tci-thaijo.org/index.php/RNJ/article/view/275448.