by W. James Popham $7.00
by Drs. Sisdjiatmo Kusumosuwidho, M.Sc $9.00
by Alleen H. Lipis, dkk $9.00
by Dr. Ibrahim Bafadal, M.Pd $9.00
by Drs. Mardalis $6.00
by TMII $6.00
by H. Rahmat Rukmana $5.00