by Marihot P. Siahaan, S.E. $12.00
by Sandra Brown $9.00
by Prof. J. Supranto, M.A., APU $11.00
by Rosemary Kesauly $7.00
by Joeniarto, S.H $7.00
by H.A. Aziz Salim Basyarahil $5.00