by Bambang Sunggono $9.00
by Sardiman AM $9.00
by FMIPA Universitas Indonesia $6.00
by Prof. Dr. S. Nasution, M.A. $9.00
by Ali Harb $9.00
by Ahmad Qodri Azizy $7.00
by Prof. Dr. S. Nasution, M.A. $7.00