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Jefferson, T; Di Pietrantonj, C; Al-Ansary, LA; Ferroni, E; Thorning, S; Thomas, RE (2010-02-17). „Vaccines for preventing influenza in the elderly“. The Cochrane database of systematic reviews (2): CD004876. doi:10.1002/14651858.CD004876.pub3. PMID20166072.
Osterholm, MT; Kelley, NS; Sommer, A; Belongia, EA (Jan 2012). „Efficacy and effectiveness of influenza vaccines: a systematic review and meta-analysis“. The Lancet. Infectious diseases. 12 (1): 36–44. doi:10.1016/S1473-3099(11)70295-X. PMID22032844.
Jefferson, T; Di Pietrantonj, C; Al-Ansary, LA; Ferroni, E; Thorning, S; Thomas, RE (2010-02-17). „Vaccines for preventing influenza in the elderly“. The Cochrane database of systematic reviews (2): CD004876. doi:10.1002/14651858.CD004876.pub3. PMID20166072.
Jefferson, T; Di Pietrantonj, C; Rivetti, A; Bawazeer, GA; Al-Ansary, LA; Ferroni, E (2014-03-13). „Vaccines for preventing influenza in healthy adults“. The Cochrane database of systematic reviews. 3: CD001269. PMID24623315.