by Radiks Purba $12.00
by Gunawan Widjaja & Kartini Mulyadi $7.00
by Drs. G. Kartasapoetra $9.00
by Dr. Siswanto Sumarso, S.H. M.H $9.00
by $6.00
by Prof. J. Supranto, M.A., APU $11.00