She started life as a bit-part sidekick to The Joker but is now a multi-platform anti-hero.
Harley Quinn Turns 25 - Previews World
Worlds' Finest: Huntress and Power Girl #12 review – Too Dangerous For a Girl 2
My Geeky Geeky Ways: February 2015
Review: Harley Quinn #25 - Dark Knight News
EXPERT COMMENT: Growing old disgracefully: DC comics' Harley Quinn turns 25
Harley Quinn Turns 25 - Previews World
What Is The Mood Of The Dark Knight
HARLEY QUINN #25
DC Leaves Harley Quinn Unrecognizable After 30 Years
Weird Science DC Comics: Starfire #10 Review and **SPOILERS**
PDF) Growing old disgracefully: DC comics' Harley Quinn turns 25