Bitzer, G. W. Billy Bitzer: His Story. New York: Farrar, Straus & Giroux, 1973, p. 90. Retrieved via Internet Archive, June 16, 2023; hereinafter cited as "Bitzer". ISBN0374112940.
Iris Barry, "Why Wait for Posterity?" Hollywood Quarterly, Vol. 1, No. 2 (Jan. 1946), pp. 131–137. Mary Pickford had purchased negatives and prints many of her Biograph films in the 1920s. Christel Schmidt, "Preserving Pickford: The Mary Pickford Collection and the Library of Congress", The Moving Image, Volume 3, Number 1, Spring 2003, pp. 59–81. The Search for a Film Legacy: Mary Pickford 1909–1933, Library of Congress Report.
