by Dr. H. Amzah B. Uno, M.Pd
$7.00

by Asghar A. Engineer
$6.00

by Drs. Hadiyanto, M.Ed
$9.00

by M. Hadi Masruri
$7.00

by FMIPA Universitas Indonesia
$6.00

by Prof. Dr. S. Nasution, M.A.
$7.00