Sources:
2006 West Nickel Mines School shooting - Wikipedia
'The happening': 10 years after the Amish shooting | Pennsylvania | The Guardian
Forgiven: The Amish School Shooting, a Mother's Love, and a Story of Remarkable Grace: Terri Roberts, Windle, Jeanette, Lewis, Beverly: 9780764217326: Amazon.com: Books
StoryCorps: A Decade After Amish School Shooting, Gunman's Mother Talks Of Forgiveness : NPR
Gunman kills five students at Amish school | October 2, 2006 | HISTORY
Charles Carl Roberts | Murderpedia, the encyclopedia of murderers
