Campbell in Stoa 1999, vol. 2/5, avec référence au Baltimore Sun, America's fortress of Spies, de Scott Shane et Tom Bowman, 3.12.1995, et au Washington Post, French Recent US Coups in New Espionnage, de William Drozdiak
Duncan Campbell in STOA 1999, Part 2/5, with reference to Baltimore Sun, America's Fortress of Spies, by Scott Shane and Tom Bowman, 3 December 1995, and Washington Post, Recent US Coups in New Espionnage, by William Drozdiak