text Demak Media Ilmu 1996 ind 108 hlm ilus 21 cm Rm. Francis D. Yury Bibliografi : hlm. 108 Sistem interkomunikasi 621.3893 20090227022752.0 YOGYA-02090000017519 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)