Cita APA (7a ed.)

Bungert, H., Heitmann, J., & Wala, M. (2003). Secret intelligence in the twentieth century. Frank Cass.

Cita Chicago Style (17a ed.)

Bungert, Heike, Jan Heitmann, y Michael Wala. Secret Intelligence in the Twentieth Century. London ; Portland, OR: Frank Cass, 2003.

Cita MLA (8a ed.)

Bungert, Heike, et al. Secret Intelligence in the Twentieth Century. Frank Cass, 2003.