Title: Gotham City Sirens:Union HC
Publication Date: 2010 (On Sale: April 14, 2010)
Format: 176-Page Hardcover w/Dustjacket
Cover Price: $19.99
Collection Group: DC Universe
Contents: Gotham City Sirens #1-7

Stories:

• Catwoman/Harley Quinn: "Union" (22 pages)
  Paul Dini (Writer) Guillem March (Artist) Steve Wands (Letterer) Jose Villarrubia (Colorist)
  Reprinted From: Gotham City Sirens #1 (2009)

• Catwoman/Harley Quinn: "Girls Talk" (22 pages)
  Paul Dini (Writer) Guillem March (Artist) Steve Wands (Letterer) Jose Villarrubia (Colorist)
  Reprinted From: Gotham City Sirens #2 (2009)

• Catwoman/Harley Quinn: "Riddle Me This" (22 pages)
  Scott Lobdell (Writer) Guillem March (Artist/Colorist) Travis Lanham (Letterer)
  Reprinted From: Gotham City Sirens #3 (2009)

• Catwoman/Harley Quinn: (No Title) (22 pages)
  Paul Dini (Writer) Guillem March (Artist) Steve Wands (Letterer) Jose Villarrubia (Colorist)
  Reprinted From: Gotham City Sirens #4 (2009)

• Catwoman/Harley Quinn: "Out of the Pest" (22 pages)
  Paul Dini (Writer) Guillem March (Artist) Steve Wands (Letterer) Tomeu Morey (Colorist)
  Reprinted From: Gotham City Sirens #5 (2009)

• Catwoman/Harley Quinn: (No Title) (22 pages)
  Paul Dini (Writer) Guillem March (Artist) Travis Lanham (Letterer) Tomeu Morey (Colorist)
  Reprinted From: Gotham City Sirens #6 (2010)

• Catwoman/Harley Quinn: "Holiday Story" (22 pages)
  Paul Dini (Writer) David Lopez (Penciller) Alvaro Lopez (Inker) Steve Wands (Letterer) Tomeu Morey (Colorist)
  Reprinted From: Gotham City Sirens #7 (2010)