(en) Julie Wheelwright, The fatal lover : Mata Hari and the myth of women in espionage, Collins & Brown, , 186 p. (ISBN978-1-85585-105-4, lire en ligne), p. 134
(en) George Barton, Celebrated spies and famous mysteries of the great war, The Page Company, , 189–214 p. (lire en ligne)
(en) The New York times current history : the European war, Volume 15, The New York Times Company, april–june 1918 (lire en ligne), p. 234