by Senjum H. Manulang, S.H $9.00
by Drs. S. Margono $9.00
by Henry Simamora, S.E $18.00
by Prof. Dr. Suharsimi Arikunto $9.00
by Drs. Ibnu Syamsi, S.H $7.00
by Drs. Sudarsono, S.H., M.Si $7.00