Google debuts knowledge project // BBC, 15 декември 2007. Посетен на 15 декември 2007. Many experts see the initiative as an attack on the widely used Wikipedia communal encyclopaedia.
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Manber, Ubi. Encouraging people to contribute knowledge // Google, 13 декември 2007. Earlier this week, we started inviting a selected group of people to try a new, free tool that we are calling knol, which stands for a unit of knowledge. Our goal is to encourage people who know a particular subject to write an authoritative article about it.
Sullivan, Danny. Google Knol – Google's Play To Aggregate Knowledge Pages // Search Engine Land, 13 декември 2007. Архивиран от оригинала на 2008-07-24. Посетен на 17 декември 2007. Google Knol is designed to allow anyone to create a page on any topic, which others can comment on, rate, and contribute to if the primary author allows. [...] Google also stressed to me [...] that the service might not launch at all.
Sullivan, Danny. Google Knol – Google's Play To Aggregate Knowledge Pages // Search Engine Land, 13 декември 2007. Архивиран от оригинала на 2008-07-24. Посетен на 17 декември 2007. Google Knol is designed to allow anyone to create a page on any topic, which others can comment on, rate, and contribute to if the primary author allows. [...] Google also stressed to me [...] that the service might not launch at all.