APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

NetLibrary, Inc, et al. Secret Intelligence in the Twentieth Century. Frank Cass, 2003.