Philip Grosser portrait.
Berkman, Alexander et al.
Alcatraz - Uncle Sam's Devil's Island : Experiences of a Conscientious Objector in America during the First World War.
Philip Grosser: A True Rebel Passes Away.
Alcatraz - Uncle Sam’s Devil’s Island : experiences of a conscientious objector in America during the First World War [review].
KSL: Bulletin of the Kate Sharpley Library No. 39, July 2004.