APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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