by Ir. Suharto $7.00
by Hardiyono $6.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $6.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Drs. Ary H. Gunawan $11.00
by J.A.F. Stoner $11.00