1. ACPO Finance Committee. National police activity based costing model; 2001.
2. Audit Commission. Police paper no. 8: effective policing-performance review in police forces; 1990.
3. Audit Commission. Helping with enquiries: tackling crime effectively (paper no. 12); 1993.
4. Local authority performance indicators 1996/97: police services;Audit Commission,1998
5. Audit Commission. The publication of information direction ’98: performance indicators for the financial year 1999/2000; 1998b.