Mets will retire Jerry Koosman's number in 2020 – New York Daily News

April 23, 1969: Jerry Koosman gets his first win in Mets' miracle season – Society for American Baseball Research

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

Mets to retire numbers of Dwight Gooden, Darryl Strawberry next season - ESPN

Jerry Koosman's No. 36 retired by Mets

Ed Kranepool must be next Mets number retired after Jerry Koosman: Pantorno – Metro US

Jerry Koosman's No. 36 to Be Retired By Mets in June – NBC New York

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

Mets' Jerry Koosman is finally getting the respect he is due

Jerry Koosman – Society for American Baseball Research

Mets to Retire Jerry Koosman's Jersey - The New York Times

Tom Seaver was the one who first made Mets fans believe