Ott JJ, Irving G, Wiersma ST (December 2012). "Long-term protective effects of hepatitis A vaccines. A systematic review". Vaccine31 (1): 3–11. doi:10.1016/j.vaccine.2012.04.104. பப்மெட்:22609026.
Ott JJ, Irving G, Wiersma ST (December 2012). "Long-term protective effects of hepatitis A vaccines. A systematic review". Vaccine31 (1): 3–11. doi:10.1016/j.vaccine.2012.04.104. பப்மெட்:22609026.