HELD, G. (2004). Virtual private networking. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)HELD, Gilbert. Virtual Private Networking. John Wiley & Sons, 2004.
Lua MLA (8ú heag.)HELD, Gilbert. Virtual Private Networking. John Wiley & Sons, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.