Cubs historical sleuthing: Jim Essian edition - Bleed Cubbie Blue
July 5, 1991: Cubs' Frank Castillo pitches complete game against Cardinals for first major-league victory – Society for American Baseball Research
Managing Cubs managers throughout the years – WRITE OUT OF THE PRESSBOX
Manager Jim Essian of the Chicago Cubs looks on during an Major News Photo - Getty Images
Jim Frey - Wikipedia
Know hope The Hardball Times
Jim Ruppert: Unconventional Maddon got most out of Cubs
The Reclamation of a Franchise. How the Ricketts Family breathed life…, by Big Ben Martin, Wrigley Rapport
Chicago Cubs Managers (1876 - 2023)
Cubs historical sleuthing: Jim Essian edition - Bleed Cubbie Blue
Rick Wilkins – Society for American Baseball Research
12 Jim Essian Stock Photos, High-Res Pictures, and Images - Getty Images