by Drs. Jumingan, S.E., M.M., M.Si $11.00
by Sulistyowati Irianto, Lim Sing Meij, Firliana Purwanti $9.00
by Susmayati, B.A., dkk $6.00
by Ikhsan Rosyada Parluhutan Daulay, S.H $11.00
by Rudiger Dombusch $12.00
by Suwarno $7.00