by $7.00
by Ian Shapiro $15.00
by Andrias Harefa $6.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00
by Roger Konopasek $7.00
by H. A. Aziz Salim Basyarahil $5.00
by Prof. Dr. S. Nasution, M.A. $7.00
by Yasa Boga $6.00
