by Prof. dr. H. Sidarta Ilyas, SpM
$7.00

by Ir. Yudo Sudarto SP
$5.00

by Bambang Agus Murtidjo
$6.00

by Ir. Arifin Arief, M. P
$7.00

by Prof. DR. dr. S.M. Lumbantobing, SpS(K), SpKJ
$5.00

by Wolfgang Bock, SJ.
$3.00