Bahri, S. et al. 2022. The Comparison of Hemoglobin Levels, Blood Oxygen Saturation, and Breaths Frequency on The Lowlander and Highlander . Jurnal Biologi Tropis. 22, 2 (Mar. 2022), 353–359. DOI:https://doi.org/10.29303/jbt.v22i2.3240.