The following books belong in every treasury managers library:

Real World of Finance: 12 Lessons for the 21st Century Manger James Sagner / Hardcover / Wiley, John & Sons, Incorporated / May 2002

Corporate Cash Management: Including Electronic Funds Transfer
Alfred Hunt

The WG&L Handbook of Short-Term & Long-Term Financial Management
Dennis E. Logue (Editor)

Short-Term Financial Management: Text and Cases
Ned C. Hill and William L. Sartoris

Short-Term Financial Management
Terry S. Maness John T. Zietlow

Investment Mathematics for Finance and Treasury Professionals: A Practical Approach.
Gregory Kitter

Pension Answer Book
Stephen J. Krass

Total Cash Management: A Company-Wide System for Forecasting, Managing, and Improving Cash Flow
Alfred M. King

Corporate Liquidity: A Guide to Managing Working Capital
Kenneth L. Parkinson Jarl G. Kallberg

Electronic Data Interchange and Cash Management and the Payments System
Globecon Group, Ltd. Staff

Cross Currency Swaps
Carl R. Beidleman

Prime Cash: First Steps in Treasury Management
Kuhlmann Mills Mathis

Cash Collection and Transmission
Alistair Graham

Modern Global Cash Management: A Qualitative Approach
Steve J. Ahn