by Ir. Pracaya $6.00
by dr. Herman Cipto, SpKK(K) $6.00
by Suharso, A.S.P $6.00
by H. Rahmat Rukmana $5.00
by N. Edy Soetanto, BE. $5.00
by Ir. G. Djatmiko Sudarmo & Ir. S. J. Edy Purnomo $11.00