Gustave, Alef (1967). „Reflections on the Boyar Duma”. The Slavonic and East European Review. 45 (104): 76—123. JSTOR4205832.
Bushkovitch, Paul (2004). „Princes Cherkaaskii or Circassian Murzas: The Kabardians in the Russian Boyar Elite, 1560–1700”. Cahiers du Monde Russe. 45 (1/2): 10. JSTOR20174844.