Coat of Arms of Bulgaria from a map printed in Venice in 1692, according to Ivan Voinikov, "History of the Bulgarian State Symbols", 2005, Part I Bulgarian Coat of Arms, section III Bulgarian Coat of Arms in the period 15th century - 1878, chapter 2 <a rel="nofollow" class="external text" href="http://protobulgarians.com/Kniga%20za%20gerbovete/I.3.%202.%20Baalgarski%20gerb%20v%20Ilirskite%20gerbovnitsi.htm">Bulgarian Coat of Arms in the Illyrian Rolls of Arms</a> (in Bulgarian).
Petar Bogdan Bakshev (1601-1674).
Bozhidar Dimitrov, "Petar Bogdan Bakshev. A Bulgarian Politician and Historian from XVII century", Sofia, 1985 (in Bulgarian, online publication <a rel="nofollow" class="external text" href="http://www.promacedonia.org/bd/index.html">here</a>).