by Ali Mustafa Yaqub $6.00
by Stefan Leks $16.00
by N. Edy Soetanto, BE. $5.00
by Dr. Niels Mulder $11.00
by J. Donald Walters $5.00
by Ir. Daisy P. Sriyadi Hendaryono, M.Si & Ir. Ari Wijayani $6.00