The Leica History and Heritage by Thorsten Overgaard
Leica M5 - Wikipedia
Leica M (Typ 240) - Wikipedia
Leica M11 Monochrom
Leica announces M11-P with Content Authenticity Initiative metadata recording: Digital Photography Review
Leica M9 - Wikipedia
Leica M Monochrom Leitz Wetzlar Release Info
The Evolution of the Leica M10 Monochrom — LSI - Leica Society International
File:Leica M Monochrom Test Shots (14973888792).jpg - Wikimedia Commons
Leica M10 Monochrom Teardown « NEW CAMERA
File:Leica M Monochrom Test Shots (14973886862).jpg - Wikimedia Commons
Leica unveils M Monochrom Oslo Edition, limited to just 10 units: Digital Photography Review
Leica's $9,195 M11 Monochrom camera lives in a gray area of expensive minimalism - The Verge
Leica M – Wikipedia
Leica M10 - Wikipedia