by Dr. Ibrahim Bafadal, M.Pd $6.00
by Prof. Dr. H.A.R. Tilaar, MSc.Ed $9.00
by Buckle, K.A., dkk $7.00
by Dr. H. Amzah B. Uno, M.Pd $7.00
by Drs. B. Suryosubroto $9.00
by Dixon, S.L. $7.00