^Manning "1970s" in Gilbert (2012), p. 55: "Captain George Stacy had always believed in Spider-Man and had given him the benefit of the doubt whenever possible. So in Spider-Man's world, there was a good chance that he would be destined to die."
^Sanderson, Peter; Gilbert, Laura, ed. 1970s. Marvel Chronicle A Year by Year History. Dorling Kindersley. 2008: 159. ISBN 978-0756641238. In June [1973], Marvel embarked on a story that would have far-reaching effects. The Amazing Spider-Man artist John Romita, Sr. suggested killing off Spider-Man's beloved Gwen Stacy in order to shake up the book's status quo.
^Manning "1970s" in Gilbert (2012), p. 68: "This story by writer Gerry Conway and penciler Gil Kane would go down in history as one of the most memorable events of Spider-Man's life."
^David, Peter; Greenberger, Robert. The Spider-Man Vault: A Museum-in-a-Book with Rare Collectibles Spun from Marvel's Web. Running Press. 2010: 49. ISBN 0762437723. The idea of beloved supporting characters meeting their deaths may be standard operating procedure now but in 1973 it was unprecedented...Gwen's death took villainy and victimhood to an entirely new level.