tunik, tunik, 		Niningasih, Rahayu, AND 		Yuswantoro, Edi.
" The Effectiveness of Breath Relaxation with Balloon Blowing Technique towards Oxygen Saturation of COPD Patients" <em>Jurnal Pendidikan Kesehatan</em> [Online], Volume 9 Number 2 (25 October 2020)