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Garnett, G. P. (2005). "Role of Herd Immunity in Determining the Effect of Vaccines against Sexually Transmitted Disease". The Journal of Infectious Diseases191: S97–106. doi:10.1086/425271. பப்மெட்:15627236.
Menson, E. N.; Mellado, M. J.; Bamford, A.; Castelli, G.; Duiculescu, D.; Marczyńska, M.; Navarro, M. L.; Scherpbier, H. J. et al. (2012). "Guidance on vaccination of HIV-infected children in Europe". HIV Medicine13 (6): 333–336; e1–336. doi:10.1111/j.1468-1293.2011.00982.x. பப்மெட்:22296225.
Garnett, G. P. (2005). "Role of Herd Immunity in Determining the Effect of Vaccines against Sexually Transmitted Disease". The Journal of Infectious Diseases191: S97–106. doi:10.1086/425271. பப்மெட்:15627236.