The principles of scientific research text London Macdonald Co 1949 Cet. 1 ind ix, 222 hlm ilus 21 cm Paul Freedman Indeks Dasar-dasar penelitian ilmiah 508.3 20090227024522.0 YOGYA-02090000030802 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)