by Ashadi Siregar & I Made Suarjana $6.00
by $4.00
by Ir. Nur Tjahjadi $5.00
by Gianluigi Pasquale, OFM, Cap. $9.00
by Prof. Dr. Syahrin Harahap MA (Ed) $6.00
by Ir. Rahmat Rukmana $5.00