Sources:
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- Angela Henning of Einen, Germany
- Professor Henning of Einen, Germany
- Filippo Giunta Leica Screw Mount Cameras - A Systematic Approach
- William White Photomacrography - An Introduction - Focal Press 1987 ISBN 0-240-51189-1
- Theo Kisselbach The LEICA Book
- Willy Hahne Hahne Liste
- James Lager Leica: An Illustrated History. Cameras, Lenses and Accessories
- Gunter Osterloh Leica M Advanced Photo School
- Willard D. Morgan; Henry M. Lester Internet Archive: Free Download: The Leica Manual A Manual For The Amateur And Professional Covering The Entire Field Of Leica Photography (1937) PDF
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