Kirby's co-plot credit is widely acknowledged by Lee and Kirby in numerous interviews. Credit here reads: "Crafted and Choreographed by: Stan (The Man) Lee and Jack (King) Kirby."
Letters from James Judge, Joel Packer, Danny English, Alan Latawiec, Don Tyler, John Rotremmo Jr, Pete Gruenwera, and Leonard Lipton; includes Know Ye These, the Hallowed Ranks of Marveldom.