Books
Vintage Panerai - The home of the ‘References’ (1930’s-1940’s & 1950’s-1960’s) and the ‘Watches with History’ (History 1 & History 2). Might be the most comprehensive reference ever written about Panerai watches. Written by Ralf Ehlers & Volker Wiegmann
Sites Worth Your Time
Perezcope - Research into the real history of Panerai and Panerai watches
Straps
Watch Reference