"1968 Pandemic (H3N2 virus)". U.S. Centers for Disease Control and Prevention. 22 January 2019. Retrieved 2 January 2021.
"1968 Pandemic (H3N2 virus)". Centers for Disease Control and Prevention. 22 January 2019. Archived from the original on 30 January 2019. Retrieved 22 August 2020.
Coleman, Marion T.; Dowdle, Walter R.; Pereira, Helio G.; Schild, Geoffrey C.; Chang, W. K. (1968), "The Hong Kong/68 Influenza A2 Variant", The Lancet, 292 (7583): 1384–1386, doi:10.1016/S0140-6736(68)92683-4, PMID4177941
Coleman, Marion T.; Dowdle, Walter R.; Pereira, Helio G.; Schild, Geoffrey C.; Chang, W. K. (1968), "The Hong Kong/68 Influenza A2 Variant", The Lancet, 292 (7583): 1384–1386, doi:10.1016/S0140-6736(68)92683-4, PMID4177941
"1968 Pandemic (H3N2 virus)". Centers for Disease Control and Prevention. 22 January 2019. Archived from the original on 30 January 2019. Retrieved 22 August 2020.