by J. Donald Walters $5.00
by Salvatore M. Sabato, P $7.00
by Norman P. Tanner $6.00
by Ir. G. Djatmiko Sudarmo & Ir. S. J. Edy Purnomo $11.00
by Novrida Mulya Rokhma $6.00
by Dr. Ir. Wisnu Cahyadi, M.Si $6.00