by Purbowaseso, Bambang $12.00
by Kerry Patterson, Joseph Grenny, Ron McMillan, Al Switzler $12.00
by Sadono Sukirno $13.00
by Prof. DR. Taliziduhu Ndraha $7.00
by Sudjiman, H. Panuti $5.00
by Birute, Marija, F.G $7.00