Hidayati, E. R. N., A. Suharti, A. T. Suratinoyo, S. R. Zahra, and N. Nusdwinuringtyas. “Feasibility of the Modified 30-Second Sit-to-Stand Test in an Isolation Ward of Moderate COVID-19”. Medical Journal of Indonesia, Vol. 30, no. 4, Dec. 2021, pp. 306-10, doi:10.13181/mji.bc.215477.