by Ir. Endar Sugiarto $9.00
by Karl May $5.00
by Karl May $0.00
by Clive Gray, Payaman Simanjuntak, dkk $12.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Drs. H.M. Yacob Ibrahim $11.00