by N. Wahyu Sulistiyana $6.00
by John D. Powers $5.00
by Maria Etty $7.00
by Ir. H. Rahmat Rukmana - Hj. Yuyun Yuniarsih, BSc. $5.00
by K.H. Moenawar Chalil $11.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00