Hardt, Ursula. From Caligari to California: Erich Pommer's Life in the International Film Wars. Berghahn Books, 1996; ISBN 978-1-57181-025-0/ISBN 978-1-57181-930-7; LC: PN1998.3.P66 H37; BL: YC.1997.a.1899; BISAC: PER004010 PERFORMING ARTS/Film & Video/Direction & Production; HIS014000 HISTORY/Europe/Germany; HIS037070 HISTORY/Modern/20th Century; BIC: APFB Individual film directors, film-makers; HBJD European history.