American Libraries Magazine: By The Numbers--Banned Books Week 2018
The American Library Association: Frequently Challenged Books
American Library Association Office of Intellectual Freedom: Challenge in a Kentucky high school, 2016
Butler University Center for Academic Technology: Banned Books: Reasons for Banning Books
Daily Kos: You Can't Read That!
Mental Floss: 24 of the Most Banned Books of All Time
School Library Journal: Most Challenged Books of 2018