Foul ball
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- SABR Baseball Biography Project | Society for American Baseball
- Babe Ruth League, Inc. Umpire Guide
- Baseball/Softball Umpire Diagrams
- The Official Magazine of Angels Baseball Magazine May 2020
- USA Softball - Rule Speed Sheet
- 25 Quick Tips for Amateur Umpires Youth League Style
- Usssa Softball Plays
- 2021 Official Baseball Rules
- 2014 Screwball Rules.Pages
- Professionals Do Not Play Minimax: Evidence from Major League Baseball and the National Football League
- Summaries of Research Using Retrosheet Data
- Scorekeeping Guide Book
- Foul Ball Defensive Positions Bunting
- Most Misunderstood Rules
- Baseball Canada High Performance
- Softball Cheers
- Fastpitch Simplified
- Basic Softball Rules Object Softball Is Played by Two Teams of 9 Players