Walsh, T. J. (1973). Protecting your business against espionage. AMACOM.
Cita Chicago (17th ed.)Walsh, Timothy J. Protecting Your Business Against Espionage. New York: AMACOM, 1973.
Cita MLA (9th ed.)Walsh, Timothy J. Protecting Your Business Against Espionage. AMACOM, 1973.
Atenció: Aquestes cites poden no estar 100% correctes.