by Drs. Daryanto $6.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $11.00
by Drs. Inu Kencana Syafiie $9.00
by Cepi Triatna, S.Pd $7.00
by Donald J. Bawersok $12.00
by Widji Anarsis $6.00