APA (7th ed.) Citation

Walmsley, R. (1989). Special security units / by Roy Walmsley. HMSO.

Chicago Style (17th ed.) Citation

Walmsley, Roy. Special Security Units / by Roy Walmsley. London: HMSO, 1989.

MLA (9th ed.) Citation

Walmsley, Roy. Special Security Units / by Roy Walmsley. HMSO, 1989.

Warning: These citations may not always be 100% accurate.