Glenday, Craig (2009). Craig Glenday (red.). Guinness World Records 2009. GUINNESS WORLD RECORDS (paperback leid.). Random House, Inc. p. 241. ISBN9780553592566. Nuoroda tikrinta 2009-09-18. „Most popular MMORPG game(sic) In terms of the number of online subscribers, World of Warcraft is the most popular Massively Multiplayer Online Role-Playing Game (MMORPG), with 10 million subscribers as of January 2008.“
digitalspy.com
Langshaw, Mark (2009-06-06). „Guinness announces gaming world records“. Digital Spy Limited. Suarchyvuota iš originalo 2009-09-01. Nuoroda tikrinta 2009-09-18. „Blizzard's Mike Morhaime and Paul Sams were handed awards for World of Warcraft and Starcraft, which won Most Popular MMORPG and Best Selling PC Strategy Game respectively.“
Langshaw, Mark (2009-06-06). „Guinness announces gaming world records“. Digital Spy Limited. Suarchyvuota iš originalo 2009-09-01. Nuoroda tikrinta 2009-09-18. „Blizzard's Mike Morhaime and Paul Sams were handed awards for World of Warcraft and Starcraft, which won Most Popular MMORPG and Best Selling PC Strategy Game respectively.“