J. Christoph Amberger. "How to Defend a Monopoly, or: Strategic Planning in Running a Salle". Classical Fencing. Archived from the original on 2018-11-07. Retrieved 2009-07-25. https://web.archive.org/web/20181107104540/http://www.classicalfencing.com:80/articles/Angelo.php
"Archived copy". Archived from the original on 2010-05-25. Retrieved 2009-07-25.{{cite web}}: CS1 maint: archived copy as title (link) accessed 7/25/2009 https://web.archive.org/web/20100525024932/http://pages.sbcglobal.net/blyle/Angelo/46.png
J. Christoph Amberger. "How to Defend a Monopoly, or: Strategic Planning in Running a Salle". Classical Fencing. Archived from the original on 2018-11-07. Retrieved 2009-07-25. https://web.archive.org/web/20181107104540/http://www.classicalfencing.com:80/articles/Angelo.php