by Clara Ng $6.00
by Mira W. $7.00
by Dergibson Siagian & Sugiarto $13.00
by Lilly T. Erwin $11.00
by I Nyoman Suaka, Drs. $8.00
by Ir. Rustam Hakim, M.T., IALI & Dr. Ing. Ir. Eka SediadiR., IAI $9.00