@book{UBHD-1058858, author={Pedretti, Carlo}, title={Leonardo :a study in chronology and style}, publisher={Thames & Hudson}, address={London}, year={1973}, pages={192 S. m. 177 Abb.}, language={eng}, isbn={0-500-49011-2 and 978-0-500-49011-2}, library={UB [Signatur: 74 B 3202]}, }