by Prof. Dr. dr. Siti A. Boediardja, dr. Titi Lestari Sugito
$6.00

by dr. Daniel Makes, Prof. Dr. dr. Susworo
$5.00

by Pelezar. Michael J. & E.C.S. Chan
$11.00

by WK
$11.00

by Soedarmo, Sumarmo Poorwo
$6.00

by Aziz Alimul
$7.00