Cita APA (7a ed.)

Gravelle, J. (2014). Researching the police in the 21st century: International lessons from the field. Palgrave Macmillan.

Cita Chicago Style (17a ed.)

Gravelle, James. Researching the Police in the 21st Century: International Lessons from the Field. Basingstoke [u.a.]: Palgrave Macmillan, 2014.

Cita MLA (8a ed.)

Gravelle, James. Researching the Police in the 21st Century: International Lessons from the Field. Palgrave Macmillan, 2014.