by Trim Sutidja $5.00
by Stephen R. Covey & Roger Merill $9.00
by Ir. M. Iqbal Hasan $11.00
by Gustian Djuanda & Irwansyah Lubis $12.00
by Edilius, S.E dan Drs. Sudarsono, S.H., M.Si $9.00
by Ali Imron, M.Pd $7.00