I just have to add the entire line of books by Edward Tufte.
1) The Visual Display of Quantitative Information
2) Visual Explanations: Images and Qauntities, Evidence and Narrative
3) Envisioning Information
After reading these books and using some of his thoughts in my presentations to management it was amazing how people were finally understanding what I was trying to explain to them and they would help me to fix the broken pieces of our processes and applications.