Dorril, S. (2002). M16: Inside the covert world of Her Majesty's secret intelligence service. New York: Simon & Schuster.
Dyfyniad Arddull ChicagoDorril, Stephen. M16: Inside the Covert World of Her Majesty's Secret Intelligence Service. New York: Simon & Schuster, 2002.
Dyfyniad MLADorril, Stephen. M16: Inside the Covert World of Her Majesty's Secret Intelligence Service. New York: Simon & Schuster, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.