Kirby's co-plot credit is widely acknowledged by Lee and Kirby in numerous interviews. Credit here reads: "Welcome to the grandeur that is Marvel, produced proudly by: Stan (The Man) Lee and Jack (King) Kirby."
Item!; Stan's Soapbox; The Mighty Marvel Checklist
Letters from John Dodd, Lamar Mauldin, Mark Cordisio, Donald McGregor, George Ferguson, S. L. Cox, Bill Lewis, Cutler Ross Jr., Sgt. Michael Kuhne.