1 1 10 Prof. Dr. Abdurrahman Ritonga, MPd Primary Author Dra. Riwayati, MSi Contributor Dra. Uswatun Hasanah, MSi Contributor Drs. Mufti Sudibyo, MSi Contributor Drs. Anthonius Sinaga, MSi Contributor Drs. Lazuardi, MSi Contributor Ir. Rumilla, MT Contributor Dra. Rosni, MPd Contributor Drs. Muhammad Arif, MPd Contributor Drs. M. Y. Tawar Sembiring, SU Contributor Dra. Martina Restuati, MSi Contributor Drs. B. T. Ritonga, MSi Contributor Drs. Tonggo Sinaga, MSi Contributor Dra. Kuning Tarigan, MSi Contributor Dra. Tiursani Lubis Contributor Dra. Rumilla, MT Contributor Drs. Nursyiman, MSi Contributor Drs. Rachmat Mulyana Contributor Drs. Nurmala Brutu Contributor mixed material 9799242339 Jakarta Penerbit Fakultas Ekonomi UI 2001