by Moenaf H. Regar $9.00
by Prof. Dr. Suharsimi Arikunto $6.00
by Dra. Hj. Etin Solihatin, M.Pd, Rahardjo, S.Pd $7.00
by Prof. Dr. H.A.R. Tilaar, MSc.Ed $11.00
by Helbert A. Simon $13.00
by Drs. Rohadi Abdul Fatah $7.00