KAUFMAN (Charlie) / PERLMAN (Radia), . (2002). Networks Security. : Prentice Hall of India New Delhi.
KAUFMAN (Charlie) / PERLMAN (Radia), . 2002. Networks Security. : Prentice Hall of India New Delhi.
KAUFMAN (Charlie) / PERLMAN (Radia), . Networks Security. : Prentice Hall of India New Delhi. 2002.
