by Gregory Grossman $9.00
by Endar Sugiarto & Ir. Kusmayadi $9.00
by Baum, Warren C & Stokes M. Tolbert $9.00
by Dr. C. Asri Budiningsih $7.00
by Prof. Dr. Suharsimi Arikunto $6.00
by J. Bulatau, SJ $5.00