James David Bourchier,
1911 Encyclopædia Britannica, Volume 4…
(1911)
“ BULGARIA, a kingdom of south-eastern Europe, situated in the north-east of the Balkan Peninsula, and on the Black Sea. From 1878 until the 5th of October 1908, Bulgaria was an autonomous and tributary principality, under the suzerainty of the sultan of Turkey. ”
