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.
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 оригиналана 24 юли 2008.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 оригиналана 24 юли 2008.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.
