by Drs. Ec. Suyadi Prawirosentono, M.B.A $7.00
by Prof. Dr. Suharsimi Arikunto $9.00
by - $12.00
by Dr. Ibrahim Bafadal, M.Pd $6.00
by Irianto Aritonang $6.00
by Drs. G. Kartasapoetra $12.00