George P. Majeska: Russian Travelers to Constantinople in the Fourteenth and Fifteenth Centuries. Dumbarton Oaks, 1984, s. 277. ISBN 0-88402-101-7. Google Books(ang.)
George P. Majeska: Russian Travelers to Constantinople in the Fourteenth and Fifteenth Centuries. Dumbarton Oaks, 1984, s. 277-283. ISBN 0-88402-101-7. Google Books(ang.)
google.pl
books.google.pl
Robert Ousterhout: Master Builders of Byzantium. UPenn Museum of Archaeology, 2007, s. 77-78. ISBN 1-934536-03-2. Google Books(ang.)