by Drs. Rusyadi., dkk $28.00
by - $9.00
by Donald J. Bawersok $12.00
by Prof.Drs. H. Rustam E. Tamburaka, M.A. $9.00
by Eddy Tano, Dipl. Chem. Eng. $7.00
by DR. A. Saleh Abdullah $9.00
by Budi Samadi $6.00