by Tony Buzan $9.00
by Sisca Soewitomo $6.00
by Chapra, Steven C. dan P. Canale Raymond $11.00
by dr. Nur Asikin, dr. V. Sutarmo, dr. Nanang S. $6.00
by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo $6.00
by Imelda Akmal $6.00
by H. Rahmat Rukmana $6.00
by $18.00
by $9.00
by M. Ahmad Muabbir al-Qathany, dkk $5.00
by Hadi Soesastro et.al $5.00
