- ^ Pensel p.92
- ^ Suit p.115
- Pensel, Hans. Seastrom and Stiller in Hollywood: Two Swedish Directors in Silent American Films 1921-1930. Vantage Press, 1969.
- Suit, Kenneth. James Friedrich and Cathedral Films: The Independent Religious Cinema of the Evangelist of Hollywood, 1939-1966. Lexington Books, 2017.