by Drs. Muchdarsyah Sinungan $7.00
by Dr. Nurdin Muhammad Suin $7.00
by Audrey Kahin $18.00
by Prof. Dr. Sukardi, Ph.D $9.00
by Drs. Abdullah Ali, Drs. Misbandono, dan Ir. Eny Rahma $7.00
by Hendrawan S. $7.00