selected Neil Gaiman bibliography: 

 Sandman, Stardust, Neverwhere
  American Gods

further information on Neil Gaiman: 

 neilgaiman.com

character: 

 Sunday appears in The Man Who Was
  Thursday by G.K.Chesterton

further information on G.K.Chesterson: 

 dur.ac.uk/~dcs0mpw/gkc/