Cita APA (7a ed.)

(1991). A system of European police co-operation in 1992: Working paper series.

Cita Chicago Style (17a ed.)

A System of European Police Co-operation in 1992: Working Paper Series. Edinburgh, 1991.

Cita MLA (9a ed.)

A System of European Police Co-operation in 1992: Working Paper Series. 1991.