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Honorary member of the Bulgarian Academy of Sciences.
- Chisholm, Hugh, ed. (1911). "Bulgaria/Language". Encyclopædia Britannica (11th ed.). Cambridge University Press.
- See Hertslet, Edward (1891), "Turkish Firman approving Gabriel Pasha Crestovitch as Governor-General of Eastern Roumelia, 16 May 1884", The Map of Europe by Treaty; which have taken place since the general peace of 1814. With numerous maps and notes, IV (1875-1891) (First ed.), London: Her Majesty's Stationery Office, p. 2777, retrieved 2013-01-12