There are a number of books on NYC newspapers. I list some below. I have read the books by Kluger, Nevins, Steele & O'Brien, not the others. There are also recent biographies of important journalists associated with these papers: Horace Greeley, James Gordon Bennett & Joseph Pulitzer come to mind. In addition, if you do a search in the America: History & Life database, you will find a number of articles on a specific aspect or era of the history of a number of NYC papers, or of the press in NYC.
Robertson, Charles L. The International Herald Tribune: The First Hundred Years. New York : Columbia University Press, 1987.
Kluger, Richard. The Paper: The Life and Death of the New York Herald Tribune. New York : Knopf, 1986.
Nevins, Allan, 1890-1971. The Evening Post: A Century of Journalism. New York : Boni and Liveright, [c1922]
Cuozzo, Steven D. It's Alive!: How America's Oldest Newspaper Cheated Death and Why It Matters. New York : Times Books, 1996.
Steele, Janet E. The Sun Shines For All: ournalism and Ideology in the Life of Charles A. Dana. Syracuse, N.Y. : Syracuse University Press, 1993.
O'Brien, Frank Michael. The Story of the Sun, New York: 1833-1928. New York, London, D. Appleton and company, 1928.
Juergens, George. Joseph Pulitzer and the New York World. Princeton, N.J. : Princeton University Press, 1966.
George A. Thompson
Author of A Documentary History of "The African Theatre", Northwestern Univ. Pr., 1998.