by Kasmir, S.E., M.M $13.00
by Terry Ponoban, Pr $5.00
by dr. Clifford Rose & dr. Paul Davies $6.00
by Salim HS, S.H., M.S. $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by $11.00