Witriyani (2025) “Effectiveness of Progressive Muscle Relaxation in Reducing Insomnia Severity Among Older Adults: Implementasi Relaksasi Otot Progresif Terhadap Penurunan Skala Insomnia Pada Lansia”, Informasi dan Promosi Kesehatan , 4(1), pp. 35–46. doi: 10.58439/ipk.v4i1.368.