Weatherly, Jeffrey N.; Petros, Thomas V.; Christopherson, Kimberly M.; Haugen, Erin N. (1. april 2007). «Perceptions of Political Bias in the Headlines of Two Major News Organizations». Harvard International Journal of Press/Politics. 2 (på engelsk). 12: 91–104. ISSN1081-180X. doi:10.1177/1081180X07299804. Besøkt 29. juli 2021. «Significant perceptions of bias were found. Overall, headlines taken from CNN were rated as significantly more liberal than those taken from FOX News.»
Schulte, Gabriela (24. mars 2021). «Poll: Roughly half say CNN, FOX have partisan media bias». TheHill (på engelsk). Besøkt 29. juli 2021. «Forty-eight percent of registered voters in the March 19-22 survey said Fox News has conservative media bias while 47 percent said CNN has liberal media bias.»
Weatherly, Jeffrey N.; Petros, Thomas V.; Christopherson, Kimberly M.; Haugen, Erin N. (1. april 2007). «Perceptions of Political Bias in the Headlines of Two Major News Organizations». Harvard International Journal of Press/Politics. 2 (på engelsk). 12: 91–104. ISSN1081-180X. doi:10.1177/1081180X07299804. Besøkt 29. juli 2021. «Significant perceptions of bias were found. Overall, headlines taken from CNN were rated as significantly more liberal than those taken from FOX News.»