References
^ Ralph E Jacobson (2012). The Manual of Photography: Photographic and Digital Imaging, Focal Press. ISBN 9780240515748 (revised Mar 2012)^ Ralph E Jacobson (2012). The Manual of Photography: Photographic and Digital Imaging, Focal Press. ISBN 9780240515748 (revised Mar 2012)^ Ralph Jacobson PhD ASIS FRIC FBIPP CChemManual of Photography, Ninth Edition (Media Manual), Focal Press. Amazon. ISBN 9780240515748 (revised Nov 2014)
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