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Pletz MW, Maus U, Krug N, Welte T, Lode H (September 2008). "Pneumococcal vaccines: mechanism of action, impact on epidemiology and adaption of the species". International Journal of Antimicrobial Agents. 32 (3): 199–206. doi:10.1016/j.ijantimicag.2008.01.021. PMID18378430. S2CID10514479.
"Vaccine Fund". PneumoADIP. Global Alliance for Vaccines and Immunization (GAVI); Johns Hopkins Bloomberg School of Public Health. Archived from the original on 8 February 2011.