(en) Robert W. Tolf, The Russian Rockefellers : the saga of the Nobel family and the Russian oil industry, Stanford, Calif, Hoover Institution Press, Stanford University, coll. « Hoover institution publication » (no 158), , 269 p. (ISBN978-0-8179-6581-5, OCLC462974339), p. 1
(en) Daniel Yergin, The Prize : The Epic Quest for Oil, Money, and Power, New York, Simon & Schuster, , 885 p. (ISBN978-0-671-79932-8, OCLC444038378), p. 58