"STATEMENT OF INFORMATION". Secretary of State of the State of California. January 24, 2005. Archived from the original on April 19, 2023. Retrieved April 19, 2023.
"STATEMENT OF INFORMATION". Secretary of State of the State of California. March 22, 2006. Archived from the original on April 19, 2023. Retrieved April 19, 2023.
campaignlive.co.uk
Kemp, Ed (September 2, 2008). "Top Up TV signs PlayPhone deal". www.campaignlive.co.uk. Haymarket Media Group Ltd. Archived from the original on April 13, 2023. Retrieved April 13, 2023.
eir-parts.net
ssl4.eir-parts.net
"PlayPhone, Inc.の株式の取得(子会社化)に関するお知らせ"(PDF) (in Japanese). GungHo Online Entertainment, Inc. October 29, 2014. Archived(PDF) from the original on April 19, 2023. Retrieved April 19, 2023.
"PlayPhone, Inc.の株式の取得(子会社化)に関するお知らせ"(PDF) (in Japanese). GungHo Online Entertainment, Inc. October 29, 2014. Archived(PDF) from the original on April 19, 2023. Retrieved April 19, 2023.
"STATEMENT OF INFORMATION". Secretary of State of the State of California. January 24, 2005. Archived from the original on April 19, 2023. Retrieved April 19, 2023.
"STATEMENT OF INFORMATION". Secretary of State of the State of California. March 22, 2006. Archived from the original on April 19, 2023. Retrieved April 19, 2023.
Kemp, Ed (September 2, 2008). "Top Up TV signs PlayPhone deal". www.campaignlive.co.uk. Haymarket Media Group Ltd. Archived from the original on April 13, 2023. Retrieved April 13, 2023.