2011年9月期決算説明会 [September 2011 Balance Sheet Explanation Meeting] (PDF) (in Japanese). Dwango. Archived(PDF) from the original on September 19, 2016. Retrieved December 24, 2010.
"Gudadada Notice" (in Japanese). Nico Nico Douga Developer's Blog. August 8, 2007. Archived from the original on August 17, 2007. Retrieved October 12, 2007.
2011年9月期決算説明会 [September 2011 Balance Sheet Explanation Meeting] (PDF) (in Japanese). Dwango. Archived(PDF) from the original on September 19, 2016. Retrieved December 24, 2010.
"Gudadada Notice" (in Japanese). Nico Nico Douga Developer's Blog. August 8, 2007. Archived from the original on August 17, 2007. Retrieved October 12, 2007.