Ramsaye, Terry. "Griffith Evolves Screen Syntax", A Million and One Nights: A History of the Motion Picture. New York: Simon and Schuster, 1964, image and caption facing page 510. Internet Archive (IA), San Francisco, California. Retrieved 21 April 2021.
Schickel, Richard. Chapter Six: "Mastery", D.W. Griffith: An American Life. New York: Simon and Schuster, 1984, pp. 111, 122-125. IA. Retrieved 25 April 2021.
Graham, Cooper C.; Steve Higgins, Elaine Mancini, and João Luiz Viera. "Introduction", D. W. Griffith and the Biograph Company] (DWG&BC). Metuchen, New Jersey and London: The Scarecrow Press, 1985, pp. 1-3. IA. Retrieved 6 April 2021.
"Biograph Identities Revealed", Motography (Chicago), 5 April 1913, p. 222. IA; refer to Kelly R. Brown's Florence Lawrence, the Biograph Girl: America's First Movie Star (1999) about Biograph's policy of using anonymous or "unnamed" actors.
"SOUND SHORTS/Love, Honor and Oh Baby", Motion Picture News, 15 February 1930, p. 70; "Along The Rialto", The Film Daily (New York, N.Y.), 8 December 1929, p. 5. IA.
"Herbert A. Yost", obituaries, Variety, 31 October 1945, p. 61. IA. Retrieved April 29, 2021.
hathitrust.org
babel.hathitrust.org
Niver, Kemp R. Early Motion Pictures: The Paper Print Collection in the Library of Congress, "Herbert Yost" searches throughout volume for related films. Washington, D.C.: Motion Picture, Broadcasting, and Recorded Sound Division, 1985. HathiTrust Digital Library. Retrieved 29 April 2021.
"Herbert Yost", highlights and some details of Yost's credited performances on Broadway (not all covering period 1914-1945). Internet Broadway Database (IBDB), The Broadway League, Manhattan, New York. Retrieved 25 April 2021.
"Jacobowsky and the Colonel", advertisement for the play's presentation at Cass Theatre in Detroit, Michigan in April 1945 after its very successful run on Broadway; advertisement published in the Detroit Evening Times, 22 April 1945, image 96. Herbert Yost credited as among principal supporting characters. "Chronicling America: Historic American Newspapers", Library of Congress (LC), Washington, D.C. Retrieved 2 May 2021.