(原始内容存档于2020-10-16) (美国英语). 多个来源: Roose, Kevin. On Gab, an Extremist-Friendly Site, Pittsburgh Shooting Suspect Aired His Hatred in Full. The New York Times. 2018-10-28
Brazilian Political Class. Democratic Brazil Revisited (University of Pittsburgh Press). 2008: 89. Porto, Mauro P. Democratization and Election News Coverage