by Ir. Joko Mulyanto
$5.00

by Prof. Dr. Sondang P. Siagian, M.P.A
$7.00

by Dr. R. Paryana Suryadipura
$12.00

by Dr. Zakiah Daradjat, dkk
$11.00

by H. Rahmat Rukmana
$6.00

by Ir. Budi Samadi
$0.00