Rahman, Farid, et al. “PROFIL KEBUGARAN KARDIORESPIRASI PADA PENDERITA OSTEOARTRITIS LUTUT DI RSUD Dr. MOEWARDI SURAKARTA”. Prosiding University Research Colloquium, May 2021, pp. 543-50, https://repository.urecol.org/index.php/proceeding/article/view/1444.