Mets to retire 1969 World Series hero Koosman's number in August

Mets retire Koosman's 36 five decades after '69 heroics

October 14, 1969: Mets win a World Series game for the Agees – Society for American Baseball Research

Thrilled to be 'joining a great crew,' Jerry Koosman, 78, has jersey retired by New York Mets - ESPN

Mets News: Mets to retire Jerry Koosman's number 36 in 2020. - Amazin' Avenue

Jerry Koosman's No. 36 retired by Mets

Uncle Mike's Musings: A Yankees Blog and More: October 6, 1969: The Mets' 1st Pennant

NY Mets 1969 world champions: 10 memorable moments from Amazin' season

Jerry Koosman: NY Mets legend on jersey retirement, World Series

The 24 best players in New York Mets history

Jerry Koosman: NY Mets legend on jersey retirement, World Series

October 16, 1969: Miracle Mets become first expansion team to win a World Series – Society for American Baseball Research

SABR Digital Library: The Miracle Has Landed: The Amazin' Story of How the 1969 Mets Shocked the World – Society for American Baseball Research

Friendship, memories and a year with the 1969 New York Mets - ESPN

Friendship, memories and a year with the 1969 New York Mets - ESPN