by Drs. Slameto $7.00
by Ravianto $6.00
by Joe Vitale $11.00
by Ny. Susmayati, B.A dan Ny. Hj. Asnidar $7.00
by Drs. Agus M. Hardjana, M.Sc., Ed $5.00
by Alam Setia Zain, S.H $7.00