Sondang P. Siagian text Jakarta Bumi Aksara 2008 Ed. Kedua id xi, 199 hlm. : 23 cm. Cet.6 Ilmu Sosial 350 979-526-492-3 241224 20241224112254 INLIS000000000001016 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)