German snipers taken prisoners in Piedimonte
Unknown author<span style="display: none;">Unknown author</span>
Melchior Wańkowicz: Monte Cassino, Warszawa, PAX 1984, <a href="//commons.wikimedia.org/wiki/Special:BookSources/83-211-0425-8" title="Special:BookSources/83-211-0425-8">ISBN 83-211-0425-8</a>.