tunik, tunik, Rahayu Niningasih, and Edi Yuswantoro. “The Effectiveness of Breath Relaxation With Balloon Blowing Technique towards Oxygen Saturation of COPD Patients”. Jurnal Pendidikan Kesehatan 9, no. 2 (October 25, 2020): 193–199. Accessed February 26, 2026. https://ojs.poltekkes-malang.ac.id/jpk/article/view/2031.