by Prof. Ir. Amris Makmur $6.00
by Eddy Tano, Dipl. Chem. Eng. $9.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $6.00
by Dr. Zakiah Daradjat, dkk $7.00
by Pandji Anoraga, S.E, M.M $7.00
by Henry Simamora, S.E $18.00