Nasrul, Ellyza. “Immunocompetent Expression of CD4+ T Cell and CD8+ T Cell, TNF-Alpha and INF-Gamma in Patient With Chronic Hepatitis C”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, vol. 7, no. 2, Jan. 2006, pp. 33-37, doi:10.24871/72200633-37.