Umamah, Farida, and Nazula Mufarrihah. “PENGARUH TERAPI TERTAWA TERHADAP TINGKAT KECEMASAN PADA LANJUT USIA DI UPTD GRIYA WERDHA SURABAYA”. Journal of Health Sciences 11, no. 1 (April 25, 2018). Accessed October 6, 2024. https://journal2.unusa.ac.id/index.php/JHS/article/view/116.