by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Hoda Lacey $11.00
by Gunawan Widjaja & Kartini Mulyadi $7.00
by Herlina Suyati Bachtiar $7.00
by Tommy H. Purwaka $11.00
by Ketut Rindjin $7.00