Cabezas, César. “Viral Hepatitis B and Delta in Perú: Epidemiology and Basis for Control”. Revista Peruana de Medicina Experimental y Salud Pública 24, no. 4 (December 30, 2007). Accessed June 23, 2024. https://rpmesp.ins.gob.pe/index.php/rpmesp/article/view/1139.