by Immanuel Wallerstein $6.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Ivy Naistadt $11.00
by Drs. Andi Baso Mappatato, M.A. $6.00
by Drs. Muchdarsyah Sinungan $9.00
by Dr. Charlie In $7.00