Dr. Ulber Silalahi, MA. text Bandung PT. Refika Aditama 2011 Ed. 1, Cet.1 Dr. Ulber Silalahi, MA. 978-602-8650-57-1 20250425102005 INLIS000000000006343 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)