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Mother Jones, A Guide to Mass Shootings in America, There have been at least 72 in the last three decades—and most of the killers got their guns legally. By Mark Follman, Gavin Aronsen, and Deanna Pan | Updated: October 2, 2015, 7:30 PM ET
Los Angeles Times, Deadliest U.S. mass shootings | 1984-2015, By LOS ANGELES TIMES STAFF, OCT. 1, 2015 12:39 P.M.
CNN, Why the U.S. has the most mass shootings, By Jen Christensen, CNN, Updated 8:33 AM ET, Fri August 28, 2015