by Drs. Wishnubroto Widarso $5.00
by Joos van Vugt $7.00
by Dr. Ir. Adji Sastrosupadi, MS $11.00
by Prof. Dr. Ir. Tri Yuwanta S.U., DEA $7.00
by Ir. M. Lies Suprapti $6.00
by J. Heinrich Arnold $8.00
by Danielle Steel $7.00