by - $9.00
by Ir. H. Rahmat Rukmana - Hj. Yuyun Yuniarsih, BSc. $6.00
by - $16.00
by Drs. Muhammad Musa asy-Syarif $6.00
by Prof. DR. Ir. H. Tridoyo Kusumastanto, MS $9.00
by Dennis F. Thompson $8.00