Letter from Kyiv Central Historical Archives signed by Director L.Y. Demchenko and head of Information Department E.V. Polozova. Letter No. 02-1132, dated November 4, 2008 addressed to Azerbaijan philologist Badulla Ajaloghlu in Baku. Photo p. 159 in Azerbaijan International, Vol. 15:2-4, 2011 "Who Wrote Azerbaijan's Most Famous Novel, "Ali and Nino": The Business of Literature.
Dr. Zaza Aleksidze (Georgia): "I am sure that 'Blood and Oil in the Orient' is not an autobiography as Essad Bey claims. It is a fiction, full of tales and mistakes and no one should rely upon it as a source for reconstructing the biography of Essad Bey." Also Dr. Farid Alakbarli (Azerbaijan), "Correcting all of Essad Bey's errors in this book would be an endless job." Both in "Critics: Fact or Fiction? What Essad Bey's Contemporaries Said," in Azerbaijan International, Vol. 15:2-4 (2011), p. 169.
Lazare, Daniel. "Jews Without Borders". The Nation. Retrieved March 28, 2005. Lazare and Reiss are secondary sources for Lev Nussimbaum's biography, not primary sources.