by - $9.00
by Dr. Oemar Hamalik $7.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $11.00
by Dr. Hamzah B. Uno, M.Pd $0.00
by Boye de Mente $12.00
by Drs. Irfan Islamy, M.P.A $7.00