by Tony Buzan $9.00
by Abdul Hamid Kissyik $6.00
by Amatullah Shafiyyah & Haryati Soeripno $6.00
by FLP Lintas Generasi $7.00
by Uskup Agung Fulton J. Sheen $6.00
by Jim Taylor, Ph.D. $11.00
by Dr. Ir. Ahmad Khalid $11.00