Sondang P. Siagian text Jakarta Bumi Aksara 2008 Ed. Revisi id xii, 136 hlm. : 21 cm. Ilmu Filsafat & Psikologi 100 979-526-866-X 241224 20241224112348 INLIS000000000001497 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)