by G. Kartasapoetra, dkk $9.00
by Drs. Syaiful Bahri Djamarah $7.00
by Ir. Rabiatual Adawyah, M.P $7.00
by Reynold a. Nicholson $7.00
by Prof. Dr. Abuddin Nata, MA $9.00
by Peter H. Lindert $26.00