This website gives a brief overview of how yellow journalism evolved and describes the battle between Joseph Pulitzer and William Randolph Hears. It also explains what yellow journalism is in more detail.
"The Katzenjammer Kids" was the first comic strip to use panels and speech balloons like modern strips do.
Today, comics continue to appear in newspapers all over the world; in the United States on Sundays alone, an estimated 113 million people read the comics, according to King Features Syndicate.
This gives us a very spread out history of the Partisan Press that I think will help with the project. Even gives information on Pulitzer and Hurst, the Penny Press and more