WWW IMDB, 27-04-2009---(Robert H. Planck; b. 1902, Huntington, Indiana, USA, d. 1971, Camarillo, California, USA; b. name, Robert Herbert Planck; alternate names, Robert Planck; cinematographer)

Internet movie database, 10-12-2003---(Robert Planck; b. 1894, d. 1963; cinematographer)

Film index international [CD-ROM], British Film Institute, 1995---