Duncan Campbell in STOA 1999, Vol 2/5, con riferimento al Baltimore Sun, America's fortress of Spies, di Scott Shane e Tom Bowman, 3.12.1995, e al Washington Post, French Recent US Coups in New Espionnage, di William Drozdiak
DuncanCampbell in STOA 1999, Vol 2/5, unter Berufung auf Baltimore Sun, America's fortress of Spies, by Scott Shane and Tom Bowman, 3.12.1995 und Washington Post, French Recent US Coups in New Espionnage, by William Drozdiak