by Nursalam $11.00
by Ir. Hieronymus Budi Santoso $5.00
by Erna Hartanto, S.Kom $5.00
by Dr. Ronald Hutapea, SKM, Ph.D $9.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A. $7.00
by Fuad bin Abdul Aziz Syalhud $7.00