a b "Harley Quinn and Poison Ivy: An Oral History of the Beginning of a Beautiful Friendship". Yahoo. October 5, 2016 . Retrieved October 2, 2021. Ching, Albert (January 21, 2014). "Six DC Series to End in April, Including "Superman Unchained" and "Nightwing" [UPDATED]". Comic Book Resources . Retrieved July 11, 2021.

Burlingame, Russ (June 9, 2014). "Harley Quinn Scene Got Cut From Arrow Season 2 Finale". Comic Book . Retrieved June 9, 2014. Costume Evolution: The brief flash-forwards to Harleen as Harley Quinn depict her both in her original harlequin costume, and in a more casual and revealing cropped halter top and leggings similar to some of her costumes in her post- Flashpoint solo series. Unfortunately, Harleen's supervisor, Dr. Sterano, discovered her crush on the Joker after stealing her psychiatric notes with the intention of publishing them as her own. In a rage, Harleen tried to kill Sterano, but was interrupted by the guards. Rather than surrender, she killed a guard and broke the Joker out of his cell. That night, the Joker took her to the Ace Chemical Processing Plant where his persona had been born, and promised that this would be her birthday. Realizing his intention, she had struggled, but he shoved her into one of the chemical vats and watched her sink to the bottom. Afterwards, he drained it and found her inside, alive, but changed. She had lost touch with reality, which meant that she could do whatever she liked. He dubbed her Harley Quinn, and the two of them were together - until he grew tired of her. [6]Barba, Shelley E.; Perrin, Joy M., eds. (2017). The Ascendance of Harley Quinn: Essays on DC's Enigmatic Villain. Jefferson, North Carolina: McFarland. p.127. ISBN 978-1476665238.

a b Fida, Bisma (December 6, 2019). "Harley Quinn's Bat: 10 Of Her Favorite Weapons". CBR . Retrieved September 11, 2021. Betancourt, David (October 11, 2017). "This married couple helped make Harley Quinn one of the biggest names in comics". Washington Post . Retrieved September 6, 2021. Adams, Tim (May 15, 2020). "Harley Quinn's Final Issue Arrives in August". Comic Book Resources . Retrieved July 12, 2021. Harley Quinn (vol. 2) #9–13; Harley Quinn Futures End #1; Harley Quinn Invades Comic-Con International San Diego; material from Secret Origin #4 Harley will appear as a playable character in Suicide Squad: Kill the Justice League, which is set five years after the events of Arkham Knight. [201] In the game, she is part of the Suicide Squad assembled by Amanda Waller to eliminate Brainiac and the members of the Justice League brainwashed by him in Metropolis.Outcast, Hunnic (August 13, 2014). "Review of D.C. New 52 Harley Quinn Issues 1–9". The GeekCast Radio Network . Retrieved July 14, 2021. The dream sequence from Days of Our Lives in which Arleen Sorkin plays a jester, which served as inspiration for the character's creation. Dini came across the scene while watching a VHS tape of Sorkin's "favorite Days moments", which he had received from her. [9] [12] Mythology Gag: While rummaging through her clothing, Harley gets hold of her "Daddy's Little Monster" T-shirt from the 2016 Suicide Squad film.