"Almost nothing is known of his paternal grandparents, though the wife of his cousin once remarked that her husband mentioned that the grandmother was thought to be Swedish." in Ronald Bergan, Sergei Eisenstein – The New York Times.
worldcat.org
Montagu 1968, tr. 151 Montagu, Ivor (1968), With Eisenstein in Hollywood, Berlin: Seven Seas Books, OCLC8713
Seton 1952, tr. 172 Seton, Marie (1952), Sergei M. Eisenstein: A Biography, New York: A.A. Wyn, OCLC2935257
Seton 1952, tr. 174 Seton, Marie (1952), Sergei M. Eisenstein: A Biography, New York: A.A. Wyn, OCLC2935257
Montagu 1968, tr. 209 Montagu, Ivor (1968), With Eisenstein in Hollywood, Berlin: Seven Seas Books, OCLC8713
Seton 1952, tr. 167 Seton, Marie (1952), Sergei M. Eisenstein: A Biography, New York: A.A. Wyn, OCLC2935257
Seton 1952, tr. 185–186 Seton, Marie (1952), Sergei M. Eisenstein: A Biography, New York: A.A. Wyn, OCLC2935257