Hamilton, L. K. (2000). Obsidian butterfly: [an Anita Blake, vampire hunter novel] (Ace mass-market ed.). Ace Books.
Citazione stile Chigago Style (17a edizione)Hamilton, Laurell K.. Obsidian Butterfly: [an Anita Blake, Vampire Hunter Novel]. Ace mass-market ed. New York: Ace Books, 2000.
Citatione MLA (9a ed.)Hamilton, Laurell K.. Obsidian Butterfly: [an Anita Blake, Vampire Hunter Novel]. Ace mass-market ed. Ace Books, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.