na YOGYA-02090000056570 20090227034043.0 ind 979-731-482-0 010-020900000056570 005.84 005.84 Cha V DEP CHANDRALEKA, Happy Virus, worm dan trojan horse Happy Chandraleka Yogyakarta Andi 2004 xvi, 196 hlm ilus 21 cm Virus komputer YOPDYOG 28 APril 2005 1 2004-288 h CB-D. 11