Източници
http://212.39.92.39/e/prosveta/istoria_11/10.html
http://bg.wikipedia.org/wiki/%D0%A1%D0%B8%D0%BC%D0%B5%D0%BE%D0%BD_I
http://bg.wikipedia.org/wiki/%D0%97%D0%BB%D0%B0%D1%82%D0%B5%D0%BD_%D0%B2%D0%B5%D0%BA_(%D0%B1%D1%8A%D0%BB%D0%B3%D0%B0%D1%80%D1%81%D0%BA%D0%BE_%D1%81%D1%80%D0%B5%D0%B4%D0%BD%D0%BE%D0%B2%D0%B5%D0%BA%D0%BE%D0%B2%D0%B8%D0%B5)
http://bg.wikipedia.org/wiki/%D0%9A%D1%80%D1%8A%D0%B3%D0%BB%D0%B0_%D1%86%D1%8A%D1%80%D0%BA%D0%B2%D0%B0_(%D0%9F%D1%80%D0%B5%D1%81%D0%BB%D0%B0%D0%B2)
http://bg.wikipedia.org/wiki/%D0%92%D0%B5%D0%BB%D0%B8%D0%BA%D0%B8_%D0%9F%D1%80%D0%B5%D1%81%D0%BB%D0%B0%D0%B2
http://bg.wikipedia.org/wiki/%D0%9E%D1%85%D1%80%D0%B8%D0%B4%D1%81%D0%BA%D0%B0_%D0%BA%D0%BD%D0%B8%D0%B6%D0%BE%D0%B2%D0%BD%D0%B0_%D1%88%D0%BA%D0%BE%D0%BB%D0%B0
http://bg.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D1%81%D0%BB%D0%B0%D0%B2%D1%81%D0%BA%D0%B0_%D0%BA%D0%BD%D0%B8%D0%B6%D0%BE%D0%B2%D0%BD%D0%B0_%D1%88%D0%BA%D0%BE%D0%BB%D0%B0
http://www.youtube.com/watch?v=Yjb2BQvUiSM
http://bg.wikipedia.org/wiki/%D0%A1%D0%B8%D0%BC%D0%B5%D0%BE%D0%BD_I
http://bg.wikipedia.org/wiki/%D0%97%D0%BB%D0%B0%D1%82%D0%B5%D0%BD_%D0%B2%D0%B5%D0%BA_(%D0%B1%D1%8A%D0%BB%D0%B3%D0%B0%D1%80%D1%81%D0%BA%D0%BE_%D1%81%D1%80%D0%B5%D0%B4%D0%BD%D0%BE%D0%B2%D0%B5%D0%BA%D0%BE%D0%B2%D0%B8%D0%B5)
http://bg.wikipedia.org/wiki/%D0%9A%D1%80%D1%8A%D0%B3%D0%BB%D0%B0_%D1%86%D1%8A%D1%80%D0%BA%D0%B2%D0%B0_(%D0%9F%D1%80%D0%B5%D1%81%D0%BB%D0%B0%D0%B2)
http://bg.wikipedia.org/wiki/%D0%92%D0%B5%D0%BB%D0%B8%D0%BA%D0%B8_%D0%9F%D1%80%D0%B5%D1%81%D0%BB%D0%B0%D0%B2
http://bg.wikipedia.org/wiki/%D0%9E%D1%85%D1%80%D0%B8%D0%B4%D1%81%D0%BA%D0%B0_%D0%BA%D0%BD%D0%B8%D0%B6%D0%BE%D0%B2%D0%BD%D0%B0_%D1%88%D0%BA%D0%BE%D0%BB%D0%B0
http://bg.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D1%81%D0%BB%D0%B0%D0%B2%D1%81%D0%BA%D0%B0_%D0%BA%D0%BD%D0%B8%D0%B6%D0%BE%D0%B2%D0%BD%D0%B0_%D1%88%D0%BA%D0%BE%D0%BB%D0%B0
http://www.youtube.com/watch?v=Yjb2BQvUiSM