http://purl.org/dc/terms/source
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http://sega.co.jp/about/group/ (accessed 2018-10-25)
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http://sega.co.jp/about/history/ (accessed 2018-10-25)
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https://collection.rcgs.jp/resource/PACKAGE0009941
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https://ja.wikipedia.org/wiki/セガゲームス (accessed 2018-11-26)
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https://www.mobygames.com/company/sega-games-co-ltd (accessed 2018-11-26)
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