HEARNDEN , K. (1987). HD BK OF COMPUTER SECURITY. KOGAN PAGE.
Lua i Stíl Chicago (17ú heag.)HEARNDEN , KEITH. HD BK OF COMPUTER SECURITY. LONDON: KOGAN PAGE, 1987.
Lua MLA (9ú heag.)HEARNDEN , KEITH. HD BK OF COMPUTER SECURITY. KOGAN PAGE, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.