by Gustian Djuanda & Irwansyah Lubis $11.00
by Prof.Drs. H. Rustam E. Tamburaka, M.A. $9.00
by Drs. Ng. Phillips $9.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Rai Wijaya $9.00