by Pipiet Senja $9.00
by Sisca Soewitomo $6.00
by Istijanto M.M $12.00
by Dr. Tony Setiabudi, Ph.D., Dr. Hardywinoto, SKM $9.00
by John Gray, Ph.D. $9.00
by Dr. Kathy MacKinnon $20.00
by Jack Trout dan Steven Rivkin $6.00