Ridwan text Bandung Alfabeta 2009 ind vi, 418 hlm.: ill. ; 26 cm. Ridwan RESEARCH METHODS 001.42 001.42 Rid m 01 9786028361125 180316 20180316083635 INLIS000000000059985 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)