Title: Swamp Thing #20 (2011- ) (NOOK Comics with Zoom View), Author: Charles Soule
Title: Swamp Thing (1982-1996) #20 (NOOK Comic with Zoom View), Author: Alan Moore
Title: Swamp Thing (2004-) #20, Author: Joshua Dysart
Title: Swamp Thing (2000-) #20, Author: Brian K. Vaughan