References

1. Dictionary of American Biography. New York: Charles Scribner's Sons, 1935.
2. Hower, Ralph M. The History of an Advertising Agency: N. W.. Ayer and Son at Work, 1869-1939. Rev. ed. Cambridge: Harvard University Press, 1949.
3. The National Cyclopaedia of American Biography. New York: James T. White, 1916.
4. Pope, Daniel. The Making of Modern Advertising. New York: Basic Books, 1983.
5. Presbey, Frank. The History and Development of Advertising. 1929. Reprint. New York: Greenwood Press, 1968.
6. Rowell, Roland. Biographical Sketch of Samuel Rowell. Manchester, NH: William E. Moore, 1898.
7. Smythe, Ted Curtis. The Ad Men and Women: a biographical dictionary of advertising. Greenwood Press, 1994.