by Raldi Kustover $6.00
by Ir. G. Djatmiko Sudarmo & Ir. S. J. Edy Purnomo $12.00
by Prof. Dr. Ir. Tri Yuwanta S.U., DEA $7.00
by $4.00
by Lipschutz $12.00
by Ir. Abbas Siregar Djarijah $6.00
by Asy-Syaikh Khalil Yasien $7.00