^Shinagel, Michael (2010), The Gates Unbarred: A History of University Extension at Harvard, 1910–2009, Harvard University Press, p. 52,
ISBN978-0674051355
Further reading
J. Donald Adams, Copey of Harvard: A Biography of Charles Townsend Copeland (Boston:
Houghton Mifflin, 1960).
Billy Altman, Laughter's Gentle Soul: The Life of Robert Benchley. (New York City:
W. W. Norton, 1997.
ISBN0-393-03833-5).
Encyclopædia Britannica: Charles Townsend Copeland.