Tiksnadi, Badai, Nova Sylviana, Adi Cahyadi, and Alberta Undarsa. “Olahraga Rutin Untuk Meningkatkan Imunitas Pasien Hipertensi Selama Masa Pandemi COVID-19”. Indonesian Journal of Cardiology 1, no. 1 (1). Accessed July 5, 2020. https://ijconline.id/index.php/ijc/article/view/1016.