http://purl.org/dc/terms/source
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http://2015games.net/company.html (accessed 2019-09-03)
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https://en.wikipedia.org/wiki/2015_Games,_LLC. (accessed 2019-09-03)
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https://ja.wikipedia.org/wiki/2015_(企業) (accessed 2019-09-03)
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https://www.mobygames.com/company/2015-inc (accessed 2019-09-03)
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