Kusumawati, Rita Dwi, and Wachidah Yuniartika. 2020. “Penggunaan Pursed Lip Breathing Pada Penyakit Paru Obstruktif Kronik (PPOK)”. Prosiding University Research Colloquium, December, 73-83. https://repository.urecol.org/index.php/proceeding/article/view/1125.