In Mulligan, Jessica; Patrovsky, Bridgette (2003). Developing online games: an insider's guide. New Riders., Randy Farmer is quoted (p.454): "It is important to realize that the term 'avatar' was used in another game later [??] in that period (Ultima IV) and that the concept of an 'avatar' was in several works of fiction prior to the development of Habitat including Vernor Vinge's True Names and John Brunner's Shockwave Rider."
"Coining Term "Avatar"". insights from the greatest minds in video games. (dalam bahasa Inggris). Diakses tanggal 2017-12-15.
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Morgan, KC (10 March 2010). "What's So Great About IMVU?". Website Marketing. Diarsipkan dari versi asli tanggal 2019-02-03. Diakses tanggal 15 December 2012.
Morgan, KC (10 March 2010). "What's So Great About IMVU?". Website Marketing. Diarsipkan dari versi asli tanggal 2019-02-03. Diakses tanggal 15 December 2012.