by Drs. Amin Wijaja Tunggal, M.B.A $11.00
by Dr. Ir. Supli Effendi $7.00
by M.E. Dicks $6.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Loyniwati Kho $6.00
by Prof. Djafaruddin $7.00