Sources:

• Angela and Henning von Einem Leica I mod.A variations - Hengela@aol.com
• Filippo Giunta Leica Screw Mount Cameras - A Systematic Approach ISBN 978-3-89506-147-9
• Willy Hahne Hahne Liste
• Theo Kisselbach The LEICA Book
• James Lager
• Dennis Laney
• 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 - text only file) - PDF Version (large file with pictures)
• Gunter Osterloh Leica M Advanced Photo School ISBN 9781579906375
• William White Photomacrography - An Introduction - Focal Press 1987 ISBN 0-240-51189-1

The Fontenelle Collection

• Media:The_Fontenelle_Collection_-_Doc.pdf - Pierre Jeandrain's comprehensive list of Leitz and Leica publications from his collection.