Riviati, N., S. Setiati, P. W. Laksmi, and M. Abdullah. “Factors Related With Handgrip Strength in Elderly Patients”. Acta Medica Indonesiana, vol. 49, no. 3, Nov. 2017, p. 215, http://www.actamedindones.org/index.php/ijim/article/view/314.