MLA

Allen, Gregory, and Rachel Derr. Threat Assessment and Risk Analysis. Butterworth-Heinemann, 2016.

APA

Allen, G., & Derr, R. (2016). Threat Assessment and Risk Analysis. Butterworth-Heinemann.

Chicago

Allen, Gregory, and Rachel Derr. Threat Assessment and Risk Analysis. : Butterworth-Heinemann, 2016.