comprising 50 Years Leica M (Günter Osterloh, 2004, in German and English), Leica M Compendium (Jonathan Eastland, 1994), Leica M Photography (Brian Bower, 1995), Leica M: The Advanced School of Photography (Günter Osterloh, 1987) and Leica Rangefinder Practice M6 to M1 (Andrew Matheson, 1986) together with The Leica and Leicaflex Way (Andrew Matheson,10th edition, 1972) (6)