by Ir. Bambang Cahyono $7.00
by Warisno $7.00
by Dr. Ir. Muhammad Rasyaf, MS $11.00
by Thomas Paine $6.00
by M. Ghufron H. Kordi K $7.00
by Ir. H. Rahmat Rukmana & Hj. Yuyun Yuniarsih, SP., MBA., MM. $6.00
by Scott Pearson, Carl Gotsch, Sjaiful Bahri $15.00