^"2011 census". Statistikos Departamentas (Lithuania). Retrieved August 18, 2017.
^Ludwig W. Adamec, ed. (2012). Historical Dictionary of Afghanistan. The Scarecrow Press. p. 441. ISBN978-0521815291. A Russian agent, or adventurer, of Lithuanian descent, Vitkevich came to Kabul in December 1837 for the purpose of establishing commercial relations with Afghanistan.
^Brysac, Shareen Blair; Meyer, Karl Ernest (1999). The Tournament of Shadows The Great Game and the Race for Empire in Central Asia. Washington: Counterpoint. pp. 84–85. For his part, Vitkevich had reason for retinence. His life history was Dostoyevskian. A Lithuanian by birth, he belonged as a student to the ...