== Referencer ==
* {{cite book |last=Linedecker |first=Clifford L. |title=The Man Who Killed Boys: A True Story of Mass Murder in a Chicago Suburb |url=https://archive.org/details/manwhokilledboys0000line |publisher=[[St. Martin's Press]] |year=1980 |edition= 1 |isbn=0312511574}}
* {{cite book |last=Peck |first=Dennis L. |last2 = Dolch | first2 =  Norman Allan |title=Extraordinary Behavior: A Case Study Approach to Understanding Social Problems |chapter= Behavior Beyond the Boundaries |publisher=[[Greenwood Publishing Group|Greenwood]] |year=2001 |isbn=0275970574}}
* {{cite book |last=Sullivan |first=Terry |last2 = Maiken | first2 =  Peter T. |title=Killer Clown: The John Wayne Gacy Murders |publisher=[[Kensington Books#Imprints|Pinnacle]] |year=2000 |edition=Paperback |isbn=0786014229}}
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