Lusin, Natala
Baron's Education, 1992
Buku Referensi
compiled by O.S. Akhmanova ... [and others]
Foreign and National, 1959
Buku Referensi
Raptschinsky, Boris
E.J. Brill, 1952
Buku Referensi
Wade, Terence
Cambridge University Press, 2009
Buku Teks
Wassilieff, A.
Libraire Garnier Freres, [date of publication not identified]
Buku Referensi