by Prof. drh. Charles Rangga Tabbu, M.Sc., Ph.D
$13.00

by Ir. Abbas Siregar Djarijah & Ir. Harsono Puspowardoyo
$5.00

by Ir. Heinz Frick
$6.00

by Salvatore M. Sabato, P
$7.00

by Ir. Nur Tjahjadi
$6.00

by Ir. M. Lies Suprapti
$6.00