Nurgiyanta, A., and G. Noor Alivian. “Implementation Of Pursed Lip Breathing And Semi Fowler Position in COPD Patients Which Get Nebulizer in IGD: A Literature Review”. Journal of Bionursing, Vol. 2, no. 3, Nov. 2020, pp. 208-14, doi:10.20884/1.bion.2020.2.3.74.