text Jakata Rosda Jayaputra 1992 Cet. 2 ind 21 cm alih bahasa, Soeparno Judul asli : The trachtenberg speed system of basic mathematics Matematika - Ekonomi 20090227024459.0 YOGYA-02090000030466 Converted from MARCXML to MODS version 3.5 using MARC21slim2MODS3-5.xsl (Revision 1.106 2014/12/19)