found: BGN, phone 1/13/81(conv.: People's Republic of Bulgaria; short: Bulgaria; official: Narodna Republika Bŭlgariya; short: Bŭlgariya; PCLI; 43N, 25E)
found: Nihon Tōō bōeki handobukku. Rūmania Burugaria hen, 1987.
found: BGN. Foreign names decisions, Jan. 15, 1991:(former entry: Bulgaria [short], People's Republic of [conv.]; Narodna Republika Bŭlgariya [Bulgarian]; current BGN-approved entry: Bulgaria [short], Republic of [conv.]; Republika Bŭlgariya [Bulgarian]; PCLI, 43°00ʹN, 27°50ʹE)
found: Ėkonomicheskoe i sot︠s︡ialʹno-politicheskoe razvitie NRB v 80-e gody, 1987:t.p. (NRB) verso t.p. (Narodnoĭ Respubliki Bolgarii)
found: Bulgario, 1959.
found: The statesman's year-book, 1995-1996:p. 229 (Bulgaria; Republika Bulgaria)
found: Recherches sur la peinture en Bulgarie du bas Moyen Age, 1987.
found: Kotnik, Janko. Slovensko-angleški slovar, 1962:page 753 (Bolgarija: Bulgaria)
found: Getty thesaurus of geographic names online, June 25, 2016(Bulgaria (preferred); variants: Republic of Bulgaria; Bŭlgaria; Republika Bŭlgaria; Bâlgarija; Bulgariya; Bulgarie; République de Bulgarie; República de Bulgaria; Bulgarien; България = Bŭlgarii︠a︡; Република България = Republika Bŭlgarii︠a︡; Болгария = Bolgarii︠a︡; Республика Болгария = Respublika Bolgarii︠a︡; 保加利亚 = Baojialiya; 保加利亚共和国 = Baojialiya Gongheguo; Narodna Republika Bulgariya; People's Republic of Bulgaria)
