URLs

• https://ja.wikipedia.org/wiki/渡辺はじめ
• https://anidb.net/creator/115
• https://www.animenewsnetwork.com/encyclopedia/people.php?id=3151
• http://www7.atwiki.jp/anime_wiki/pages/2940.html
• https://www18.atwiki.jp/sakuga/pages/1523.html