by Dr. Abdurrahman Umairah $9.00
by Dr. K.H. Didin Hafidhuddin, M.Sc dan Hendri Tanjung, S.Si., M.M. $9.00
by K.H. Abdullah Gymnastiar $6.00
by N. Wahyu Sulistiyana $6.00
by Dr. Khalid Abu Syadi $5.00
by Warisno $7.00