American Film Personnel and Company Credits, 1908-1920: Filmographies Reordered by Authoritative Organizational and Personal Names from Lauritzen and Lundquist’s American Film-Index
Paul C. Spehr, with Gunnar Lundquist
Jefferson, North Carolina : McFarland & Company : 1996.
This index to the massive reference work by Lauritzen and Lundquist is valuable in its own right.
PSFL source: Spehr-American.