by Dr. H. Amzah B. Uno, M.Pd $7.00
by Sudarsono Soedomo $5.04
by Septiawan Santana K. $12.00
by Milton Chen, Ph.D. $6.00
by - $16.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Dr. B. Siswanto Sastrohadiwiryo $9.00