Filiya, Ana Nur, and Novy Ardyanti Putri. “Correlation Between Direct Contact Status With Diphteria in Blitar”. STRADA : Jurnal Ilmiah Kesehatan 8, no. 2 (November 19, 2019): 97–100. Accessed September 15, 2025. https://sjik.org/index.php/sjik/article/view/185.