by Prof. Soetjipto dan Drs. Raflis Kosasi, M.Sc
$9.00

by Prof. H. Muzzayin Arifin
$7.00

by Bambang Sunggono
$9.00

by Dr. Ibrahim Bafadal, M.Pd
$6.00

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

by Arief Sardiman, dkk
$11.00