by Drs. Bayu Surianingrat $7.00
by AAK (Aksi Agraris Kanisius) $9.00
by Ir. Setijo Pitojo $9.00
by DR. Farida Yusuf Tayibnapis, M.Pd $7.00
by Prof. Dr. Suharsimi Arikunto $18.00
by Prof. DR. Sukardjo $7.00