- Classic Images (US)"Lost Players"February 1988 · Iss. 152, pg. C13 · by: Billy H. Doyle
- Moving Picture World (US)"Karger Engages Directors for Three Plays to Be Filmed by Screen Classics"July 19, 1919 · pg. 352
- Moving Picture World (US)"Henry Otto Felt Call of Footlights at an Early Age"March 15, 1919 · pg. 1479, ill
- Moving Picture World (US)"Otto to Direct May Allison"January 25, 1919 · pg. 454
- Moving Picture World (US)"Otto to Be Lockwood Co-Director in Yorke-Metro"August 24, 1918 · pg. 1140, ill
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