by Ir. H. Rahmat Rukmana $6.00
by Nasution, Harun $5.00
by Tony Buzan $16.00
by Ray Levy Ph.D $9.00
by Muhammad al-Utsaimin $5.00
by Ir. Sudadi Martodireso & Ir. Widada Agus Suryanto, MM $5.00
by Panitia Kehidupan Doa, FIC. $4.00