APA (7th ed.) Citation

Cullen, P. J. (1992). The German police and European co-operation. A system of European police co-operation in 1992.

Chicago Style (17th ed.) Citation

Cullen, Peter J. "The German Police and European Co-operation." A System of European Police Co-operation in 1992 1992.

MLA (9th ed.) Citation

Cullen, Peter J. "The German Police and European Co-operation." A System of European Police Co-operation in 1992, 1992.