by Prof. J. Suprapto, M.A. APU $16.00
by Drs. Firman B. Aji dan Drs. Martin Sirait $9.00
by Baum, Warren C & Stokes M. Tolbert $7.00
by $7.00
by Nasrul Koharuddin $6.00
by Colin Coulson - Thomas $9.00