Herbert Marshall (not the actor) has written extensively on Eisenstein.
Sorry I don't have any specific references.
 
Marshall writes from a unique perspective: he was one of the few
Westerners to study at the Moscow Film school during the time that
Eisenstein taught there.  Jay Leyda is another.  I don't remember
the titles of work by either man.
 
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Cal Pryluck, Radio-Television-Film, Temple University, Philadelphia
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