Siregar, Rinco, and Rumondang Gultom. “EFFECT OF LAUGHTER THERAPY ON DEPRESSION LEVEL IN ELDERLY IN A NURSING HOME, NORTH SUMATRA, INDONESIA”. Belitung Nursing Journal 5, no. 6 (December 21, 2019): 246–250. Accessed April 27, 2024. https://www.belitungraya.org/BRP/index.php/bnj/article/view/830.