by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Dr.Taufiq Asy-Syawi $36.00
by Prof. Drs. H. Lili M. Sadeli, M.Pd $9.00
by - $9.00
by Prof. Drs. H. A. W. Widjaja $6.00
by Jannes Eudes Wawa $9.00