WCN 50 Auction Catalogue, B. Paszkiewicz, Podobna jest moneta nasza do urodnej panny, Warsaw 2012.
An interesting item authored by one of the most famous Polish numismatists and professor at the University of Wroclaw, Borys Paszkiewicz, additionally with the auction offer of WCN's auction number 50.
Hardcover lacquered, A4 format, page 234