Pertami, Sumirah Budi, Siti Munawaroh, and Ni Wayan Dwi Rosmala. 2019. “Effect of Head Elevation of 30 Degrees on Oxygen Saturation and Sleep Quality in Stroke Patients”. Health Information : Jurnal Penelitian 11 (2):134-45. https://doi.org/10.36990/hijp.v11i2.133.