Cronin, Brian. "Knowledge Waits: The History of Marvel's No-Prize: CSBG looks at the history of Marvel's celebrated No-Prize!", CBR (Feb. 11, 2016): "Over the next year or so, the letter page for the Fantastic Four became the place where Lee would interact with the entire Marvel fandom, which continued to grow as Marvel added more and more new characters like Hulk, Thor, Iron Man, Spider-Man, etc. Only Spider-Man got his own letter column initially."
Gravett, Paul. "Curt Swan: A Superman Walked Among Us," Comic Book Marketplace (2002): "When it came to his original artwork, like many comic book journeymen of his time . . . [Curt] Swan was pretty cavalier about keeping any for himself. He had no problem that much of it [was] used to be given away to readers as letter column prizes. . . ."
Carlson, K.C. "KC: LOC," Westfield Comics (September 2008). Accessed November 24, 2008: ". . . Mort Wieisinger's lettercolumns for the Superman titles . . . were big lists of 'goofs' that popped up in the books, that encouraged the worst kind of fan behavior (and indirectly inspired Stan [Lee] to create the No-Prize!)."
