by Hazairin $5.00
by Dixon, S.L. $7.00
by Drs. Husein Umar, S.E., M.M., MBA $9.00
by Anwar Arifin $6.00
by Nasution, Harun $5.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $12.00