by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Drs. Ary H. Gunawan $11.00
by Drs. Daryanto $7.00
by Dra. Nurul Zuriah, M.Si $0.00
by Drs. Daryanto $6.00
by Dr. Herman Darmawi $7.00