Tài liệu tham khảo WikiPedia: WOWAKA http://hinichijourecords.com/index.html http://hitori-atelier.com/index2.html http://ascii.jp/elem/000/000/497/497898/ http://balloom.net/artist_wowaka.html https://www.animenewsnetwork.com/news/2019-04-07/h... https://twitter.com/wowaka https://www.youtube.com/watch?v=UChsXqcSV1YRwQbfHf... https://www.oricon.co.jp/prof/498225/products/ https://www.sonymusic.co.jp/artist/hitorie/info/50... https://www.crank-in.net/interview/38049
