Cita APA (7a ed.)

Thomas, R. M. (1991). Espionage and secrecy: The Official Secrets Acts 1911 - 1989 of the United Kingdom. Routledge.

Cita Chicago Style (17a ed.)

Thomas, Rosamund M. Espionage and Secrecy: The Official Secrets Acts 1911 - 1989 of the United Kingdom. London [u.a.]: Routledge, 1991.

Cita MLA (9a ed.)

Thomas, Rosamund M. Espionage and Secrecy: The Official Secrets Acts 1911 - 1989 of the United Kingdom. Routledge, 1991.