Tarigan APS, Juliandi J. PERNAFASAN PURSED LIP BREATHING MENINGKATKAN SATURASI OKSIGEN PENDERITA PENYAKIT PARU OBSTRUKTIF KRONIS (PPOK) DERAJAT II. Keperawatan [Internet]. 2019 Jan. 28 [cited 2024 May 2];1(2):39-46. Available from: http://e-journal.sari-mutiara.ac.id/index.php/Keperawatan/article/view/426