by Budi Widianarko & Andreas Pandiangan $11.00
by Thee Kian Wie $7.00
by Drs. H. Moh. Pabundu Tika, M.M $7.00
by Prof. Dr. Sudarwan Danim $9.00
by - $18.00
by Prof. Dr. S. Nasution, M.A. $6.00
by Dono $6.00