by Prof. Dr. Sondang P. Siagian, M.P.A
$11.00

by Dr. Sofyan Syafri Harahap, M.S,Ac
$12.00

by Fachruddin H.S dan Irfan Fachruddin, S.H
$13.00

by Dr. R. Paryana Suryadipura
$11.00

by Drs. A. Hasymi Ali
$11.00

by Drs. Ajat Sudrajat
$7.00