by Drs. Amin Widjaja Tunggal, Ak., M.B.A $6.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $9.00
by Prof. Dr. Husaini Usman, M.Pd & R. Purnomo Setiady Akbar, S.Pd., M.Pd $11.00
by C. Rollin Niswonger $12.00
by Marihot P. Siahaan $16.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00