LANDON JR., Thomas. Vanguard Is Growing Faster Than Everybody Else Combined [online]. The New York Times, 14.4.2017, [cit. 2021-05-02]. Dostupné online.
vanguard.com
about.vanguard.com
Fast facts about Vanguard [online]. [Cit. 2021-05-02]. Dostupné online.