Mets retiring No. 36 of ex-pitcher Koosman in '20 - ESPN
Mets to retire Jerry Koosman's No. 36 in June - Newsday
Jerry Koosman: All Time Mets Left Handed Pitcher (Part One: 1967-1972)
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Mets to Retire Jerry Koosman's Jersey - The New York Times
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Jerry Koosman: All Time Mets Left Handed Pitcher (Part One: 1967-1972)
Jerry Koosman - Wikipedia
Mets to retire Koosman's number — Queens Daily Eagle
New York Mets: Top 10 Mets Catchers of All Time
Jerry Koosman: All Time Mets Left Handed Pitcher (Part One: 1967-1972)
Retired Number Is Latest Mets Head-Scratcher
