by Drs. H. Ahmad Yani $12.00
by Tony Buzan $9.00
by Drs. Aloysius Soenarto & Stanislaus Suliangto $4.00
by KH. Zainal Arifin Dj $6.00
by Totok S. Wiryasaputra $7.00
by Ir. Adiwarman Karim, SE, MBA, MAEP $7.00