APA (7th ed.) Citation

Quester, Shultz, & Godson. (1997). Security studies for the 21st century. Brassey's.

Chicago Style (17th ed.) Citation

Quester, Shultz, and Godson. Security Studies for the 21st Century. London: Brassey's, 1997.

MLA (8th ed.) Citation

Quester, et al. Security Studies for the 21st Century. Brassey's, 1997.