(EN) Bill Tancer, Look Who's Using Wikipedia, in Time, 1º maggio 2007. URL consultato il 1º dicembre 2007 (archiviato dall'url originale il 3 agosto 2012).
«The sheer volume of content [...] is partly responsible for the site's dominance as an online reference. When compared to the top 3,200 educational reference sites in the US, Wikipedia is No. 1, capturing 24.3% of all visits to the category»
Cfr. Bill Tancer (Global Manager, Hitwise),