by Ir. Bambang Cahyono $6.00
by Maria Monika Ratri dan Tim Penerbit OBOR $6.00
by Prof. Dr. Kees Bertens, MSC $9.00
by Ir. H. Rahmat Rukmana $5.00
by Suharso, A.S.P $9.00
by K.H. Moenawar Chalil $11.00