L. S. Stavrianos, Traian Stoianovich, "The Balkans since 1453", "Bulgarian Exarchate", p. 371: "The first great victory for Bulgarian nationalism was the establishment in 1870 of a national church known as exarchate." (en)
britannica.com
"Bulgarian Orthodox Church", Encyclopædia Britannica: "The struggle for an independent Bulgarian church, begun late in the 18th century, culminated in the establishment in 1870 of a Bulgarian exarchate." (en)
promacedonia.org
Ivo Banac, "The Macedoine", "The National Question in Yugoslavia. Origins, History, Politics", Cornell University Press, 1984, pp. 307-328. (en)