Supriatin, Titin, Yani Trihandayani, Yani Nurhayani, and Pratuma Rithpho. “The Effect of Progressive Muscle Relaxation on Sleep Quality and Anxiety Level of Students Confirmed Covid-19”. International Journal of Nursing Information 1, no. 2 (December 31, 2022): 7–12. Accessed December 30, 2024. https://journal.qqrcenter.com/index.php/ijni/article/view/23.