by Dr. Ronald Hutapea, SKM, Ph.D $9.00
by Drs. Muchdarsyah Sinungan $9.00
by Mary Grisez Kweit $13.00
by $6.00
by Prof. Mr. Dr. Sudargo Gautama $7.00
by Drs. Sudarsono, S.H., M.Si $9.00