Hill, D. A., & Rockley, L. . . . . . . . . E. (1981). Security: Its management and control. Business Books.
Lua i Stíl Chicago (17ú heag.)Hill, Denys A., agus L E. Rockley. Security: Its Management and Control. London: Business Books, 1981.
Lua MLA (9ú heag.)Hill, Denys A., agus L E. Rockley. Security: Its Management and Control. Business Books, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.