Cita APA (7a ed.)

Smith, R. J., & Helms, R. (1989). The unknown CIA: My three decades with the agency. Pergamon-Brassey's.

Cita Chicago Style (17a ed.)

Smith, Russell J., y Richard Helms. The Unknown CIA: My Three Decades with the Agency. Washington [u.a.]: Pergamon-Brassey's, 1989.

Cita MLA (9a ed.)

Smith, Russell J., y Richard Helms. The Unknown CIA: My Three Decades with the Agency. Pergamon-Brassey's, 1989.