by Dr. R. Hutapea, SKM, Ph.D $7.00
by T. Tarmizi, Lepi $6.00
by Erie Sudewo $6.25
by Prof. Dr. Makmur, M.Si $7.00
by DR. Ir. Hj. Tati Nurmala, S.W $6.00
by Robert T. Kiyosaki $12.00