by Dr. Purnawan Junadi, Ph.D $7.00
by Gustian Djuanda $11.00
by Drs. T. Gilarso, SJ $12.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $7.00
by Husein Umar $9.00
by Koeswinarno $9.00