Witriyani. “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, vol. 4, no. 1, June 2025, pp. 35-46, doi:10.58439/ipk.v4i1.368.