Cita APA (7a ed.)

Walker, N. (1991). The United Kingdom police and European co-operation. A system of European police co-operation in 1992.

Cita Chicago Style (17a ed.)

Walker, Neil. "The United Kingdom Police and European Co-operation." A System of European Police Co-operation in 1992 1991.

Cita MLA (8a ed.)

Walker, Neil. "The United Kingdom Police and European Co-operation." A System of European Police Co-operation in 1992, 1991.