Eka Sudiwati, Ni Luh Putu, Rachmadi Yuwana Kusuma, Ardi Panggayuh, and Nia Lukita Ariani. “The Covid-19 Antibody Titer of Convalescence Plasma Repeated Donors at Red Cross Indonesia of Tulungagung Regency”. International Journal of Medical Science and Clinical Research Studies 2, no. 12 (December 2, 2022): 1388–1391. Accessed July 22, 2024. https://ijmscr.org/index.php/ijmscrs/article/view/464.