The Killing Joke by Matt DeMino
The One and Only...Harley Quinn!
Joker says "Happy Halloween Moviepilot!" | Moviepilot: New Stories for Upcoming Movies
Joker & Harly Quinn
Joker Comics Your #1 Source for Video Games, Consoles & Accessories! Multicitygames.com
Mad - Harley Quinn by Steve Garcia There has to be a comic book (if there isn't already) where Harley Quinn is the boss and Joker is the helper