by Aileen Mitchel Stewart $9.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $7.00
by N. Wahyu Sulistiyana $4.00
by Dr. H. Miftah Faridl $11.00
by Tim Pustaka Familia $6.00
by Manshur Abdul Hakim $9.00