Roger Hicks (1984). A History of the 35mm Still Camera. Focal Press, London & Boston. p. 137. ISBN 0-240-51233-2. 0-240-51233-2
Rudolph Lea (1993). Register of 35mm SLR cameras. Wittig Books, Hückelhoven. p. 23. ISBN 3-88984-130-9. 3-88984-130-9
Michael R. Peres (2013), The Focal Encyclopedia of Photography, page 779, Taylor & Francis https://books.google.com/books?id=NMJxyAwGvKcC&pg=PA779