by $11.00
by Drs. Agus M. Hardjana, M.Sc., Ed $6.00
by Drs. Muchdarsyah Sinungan $12.00
by Faqihuddin Abdul Kadir $5.00
by Prof. DR. S.P. Siagian, M.P.A $9.00
by Prof. Dr. Husaini Usman, M.Pd & R. Purnomo Setiady Akbar, S.Pd., M.Pd $11.00