text Surabaya Usaha Nasional 1981 ind ix, 313 hlm ilus 1981 Piet A. Sahertian, Frans Mataheru Bibliografi : hlm. 112-113 Pendidikan - Supervisi 371.2 YOPDYOG 20090227023024.0 YOGYA-02090000019773 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)