- https://sports.yahoo.co.jp/
- https://www.youtube.com/channel/UCoyFVijgxMz6XYmFId-5O0g
- http://www.toto-dream.com/support/
- https://mainichi.jp/ama-baseball/kurojishi/?fmt=jaba
- http://www.baseballjapan.org/jpn/umpire/rulecommittee.html
- http://www.baseballjapan.org/jpn/umpire/bat.html
- https://cbt-s.com/examinee/examination/yakyu.html
- http://www.mainichi-photo.com/
- http://www.jaba.or.jp/mobile/
- http://tokyo2020.jp/jp/
- http://ringring-keirin.jp/
- http://www.japan-baseball.jp/
- http://www.baseballjapan.org/jpn/
- http://www.baseballjapan.org/eng/index.html
- http://www.npb.or.jp/
- http://www.student-baseball.or.jp/
- http://www.jubf.net/
- http://www.jhbf.or.jp/
- http://jllba.com
- http://www.littlesenior.jp/
- http://www.boysleague-jp.org/
- http://www.wbfj.jp/
- http://www.young-league.com/
- http://www.pony-japan.com/
- http://www.jsbb.or.jp/index.php
- http://www.k-ball.jp/
