Igor Hawryszkiewycz, . (2002). System Analysis & Desigen. New Delhi: Prentice-Hall.
Igor Hawryszkiewycz, . 2002. System Analysis & Desigen. New Delhi: Prentice-Hall.
Igor Hawryszkiewycz, . System Analysis & Desigen. New Delhi: Prentice-Hall. 2002.
