Nusdwinuringtyas, Nury, Widjajalaksmi Widjajalaksmi, and Adang Bachtiar. “Healthy Adults Maximum Oxygen Uptake Prediction from a Six Minute Walking Test”. Medical Journal of Indonesia 20, no. 3 (August 1, 2011): 195-200. Accessed March 29, 2024. http://mji.ui.ac.id/journal/index.php/mji/article/view/452.