Levine, B. (1995). Professional betrayers: The secret world of political spies.
Cita Chicago Style (17a ed.)Levine, Burton. Professional Betrayers: The Secret World of Political Spies. 1995.
Cita MLA (9a ed.)Levine, Burton. Professional Betrayers: The Secret World of Political Spies. 1995.
Precaución: Estas citas no son 100% exactas.