Osterholm, MT; Kelley, NS; Sommer, A; Belongia, EA (Januar 2012). «Efficacy and effectiveness of influenza vaccines: a systematic review and meta-analysis.». The Lancet. Infectious diseases. 12 (1): 36–44. PMID22032844. doi:10.1016/S1473-3099(11)70295-X.
Jefferson, T; Di Pietrantonj, C; Al-Ansary, LA; Ferroni, E; Thorning, S; Thomas, RE (17. februar 2010). «Vaccines for preventing influenza in the elderly». The Cochrane database of systematic reviews (2): CD004876. PMID20166072. doi:10.1002/14651858.CD004876.pub3.
Jefferson, T; Di Pietrantonj, C; Rivetti, A; Bawazeer, GA; Al-Ansary, LA; Ferroni, E (13. mars 2014). «Vaccines for preventing influenza in healthy adults.». The Cochrane database of systematic reviews. 3: CD001269. PMID24623315. doi:10.1002/14651858.CD001269.pub5.
Osterholm, MT; Kelley, NS; Sommer, A; Belongia, EA (Januar 2012). «Efficacy and effectiveness of influenza vaccines: a systematic review and meta-analysis.». The Lancet. Infectious diseases. 12 (1): 36–44. PMID22032844. doi:10.1016/S1473-3099(11)70295-X.
Jefferson, T; Di Pietrantonj, C; Al-Ansary, LA; Ferroni, E; Thorning, S; Thomas, RE (17. februar 2010). «Vaccines for preventing influenza in the elderly». The Cochrane database of systematic reviews (2): CD004876. PMID20166072. doi:10.1002/14651858.CD004876.pub3.
Jefferson, T; Di Pietrantonj, C; Rivetti, A; Bawazeer, GA; Al-Ansary, LA; Ferroni, E (13. mars 2014). «Vaccines for preventing influenza in healthy adults.». The Cochrane database of systematic reviews. 3: CD001269. PMID24623315. doi:10.1002/14651858.CD001269.pub5.