by Prof. Dr. Sukardi, Ph.D $9.00
by Prof. Dr. H.A.R. Tilaar, MSc.Ed $11.00
by Dra. Nurul Zuriah, M.Si $0.00
by Syam Hardy $7.00
by Ir. Sarjoni Basri $7.00
by Toemin, A. Masoem $5.00