by dr. Boyke Dian Nugraha $7.00
by Prof. Dr. Suharsimi Arikunto $11.00
by Drs. Sofwan Badri $6.00
by Kunio, Yoshihara $6.00
by Drs. Husein Umar, S.E., M.M., MBA $13.00
by Prof. DR. H. Abdul Muis Ba'dulu & Hermann, S.Ag., M.Pd $7.00
by Al. Wahjasudibja, Pr. $3.00
by Muhammad Ibrahim Saliim $6.00