by C.M. Lingga Purnama, MM. $9.00
by Kasmir, S.E., M.M $13.00
by Drs. Muda Markus & Lalu Hendry Yujana $32.00
by - $6.00
by Prof. DR. Taliziduhu Ndraha $11.00
by Dr. Ir. Kemas Ali Hanafiah, M.S., dkk $11.00