B. K. Aji, Y. Tursini, Y. Rohyadi, and S. D. KD, “HUBUNGAN DERAJAT PPOK DENGAN KUALITAS HIDUP PASIEN PPOK 2020: The Correlation of The Degree of COPD on The Quality of The Patients’ Life with COPD”, JKS, vol. 1, no. 1, pp. 156-168, Dec. 2021.