by Prof. Dr. S. Nasution, M.A. $7.00
by Prof. Drs. S. Pamudji, M.P.A $11.00
by Prof. H.M. Arifin, M.Ed $7.00
by $6.00
by Tamara Sheward & Michael Muc $7.00
by Yohanes Surya $8.00