The Sources

Links: 

1. The Beginning of the Penny Press

2. Penny Press History

3. Yellow Journalism History

4. The Associated Press History

GIF Source:

Free ClipArt

Books:

1.Campbell, J. (2001) "Yellow Journalism: Puncturing the Myths, Defining the Legacies"

2.Everett, R. (1980) "William Randolph Hearst: His Role in American Progressivism"

3.Payne, G. (1926) "History of Journalism in the United States"

4.Standage, T. (1998) "The Victorian Internet