by Abdoelmanap, Soerowo & T.H. Manurung
$6.00

by Dr. Ismail Abdul Mutalib Al-Khatib
$5.00

by Ir. Rustam Hakim, M.T., IALI
$0.00

by Prof. Dr. Sondang P. Siagian, M.P.A
$7.00

by Alan B. Mountjoy
$9.00

by Drs. Mulyono HAM, M.Pd
$11.00