SABR 50 at 50: Players – Society for American Baseball Research
Topps in 1972, Part 10 – SABR's Baseball Cards Research Committee
Retro Computer Baseball Game Review – Hardball 3 – 4 – 5 – 6
MLB Umpire Bios
1990 TOYS R US Rookies Jim Abbott Angels Baseball Card
Which pitcher currently has the slowest fastball in MLB? - Quora
SABR 50 at 50: Players – Society for American Baseball Research
SABR 50 at 50: Players – Society for American Baseball Research
C.A.: 1982 Topps Denny Lewallyn