Purnamasari, Erna, and Arvina Andhiyani. “The Effect of Laughter Therapy on Reducing Anxiety Level in Hypertension Patients”. Journal for Quality in Public Health 5, no. 1 (November 19, 2021): 312–314. Accessed September 13, 2025. https://www.jqph.org/index.php/JQPH/article/view/235.