by $11.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $11.00
by Prof. Mr. Dr. Sudargo Gautama $8.00
by Erikson Hasiholan Gultom (Prakata: DR. Todung Mulya Lubis, SH. & DR. Albert Hasibuan, SH) $13.00
by Katzung $24.00
by Hilman Hariwijaya $6.00