Mets should retire Jerry Koosman's number this year regardless of 2020 season outcome
Thrilled to be 'joining a great crew,' Jerry Koosman, 78, has jersey retired by New York Mets - ESPN
Humble Jerry Koosman joins Mets hopefully-expanding pantheon with number retirement
New York Mets - Wikipedia
Mets to retire numbers of Darryl Strawberry, Dwight Gooden
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
Mets to Retire Jerry Koosman's Jersey - The New York Times
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
NY Mets have the perfect day to retire David Wright's number 5
Mets retire Jerry Koosman's No. 36 in Citi Field ceremony
Mets retire Willie Mays' No. 24 as Old-Timers' Day returns
Mets Retire 36 for Koosman - NY Sports Day