«Important Notice: MSN Encarta to be Discontinued,» Microsoft press release (30 March 2009); Ina Fried, «Microsoft closing the book on Encarta,» CNET News (30 March 2009); «Microsoft to Shut Encarta as Free Sites Alter Market,» The Wall Street Journal (31 March 2009). Данные о Wikipedia см.: http://en.wikipedia.org/wiki/Wikipedia:About.
