by
$6.00

by Yernelis Sukma, M.S., & Yakup
$7.00

by Herman Hermit, Ir. MT.
$5.00

by T. Krispurwana Cahyadi, SJ
$7.00

by Prof. J. Suprapto, M.A. APU
$16.00

by Dr. W. Herdin Sibuea., dkk
$7.00