by Prof. Dr. Suharsimi Arikunto $7.00
by John H. Procton $7.00
by Prof. Dr. Suharsimi Arikunto $18.00
by Prof. DR. Sukardjo $13.00
by Drs. Daryanto $6.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $11.00