Cita APA (7a ed.)

Williams, P. D. (2013). Security studies an introduction (2nd ed.). Routledge.

Cita Chicago Style (17a ed.)

Williams, Paul D. Security Studies an Introduction. 2nd ed. London [etc.]: Routledge, 2013.

Cita MLA (9a ed.)

Williams, Paul D. Security Studies an Introduction. 2nd ed. Routledge, 2013.