APA (7th ed.) Citation

Crenshaw, M. (2000). The psychology of terrorism: An agenda for the 21st century. Political psychology, 21(2), 405-420.

Chicago Style (17th ed.) Citation

Crenshaw, Martha. "The Psychology of Terrorism: An Agenda for the 21st Century." Political Psychology 21, no. 2 (2000): 405-420.

MLA (9th ed.) Citation

Crenshaw, Martha. "The Psychology of Terrorism: An Agenda for the 21st Century." Political Psychology, vol. 21, no. 2, 2000, pp. 405-420.