The Hedge Fund Edge by Mark Boucher. This is as good a treatment as we've seen on macroeconomic systems and utilizing a long-cash-sort approach. At Butler, Lanz & Wagler, this book is the most often read.

Intermarket Technical Analysis by John J. Murphy. A classic, this book is a great resource of relationships that exist between asset classes.

Technical Analysis of the Financial Markets by John J. Murphy. This should be the desktop reference of every trader or investor.

Trading Systems and Methods by Perry J. Kaufman. This book is one of the best reference manuals available for developers of trading systems.

Smarter Trading by Perry J. Kaufman. While not as encyclopedic as Trading Systems and Methods, this book introduces Kaufman's systematic logic applied to trading systems. Kaufman's variable moving average is developed in this book.

Market Wizards by Jack Schwager. Simply a great book about great traders.

The New Market Wizards by Jack Schwager. Another great book about even more great traders.

The General Theory of Employment, Interest and Money by John Maynard Keynes. If you ever wondered why we think the economy acts the way it does, and why monetary policy is what it is, this book will explain that. This book is the most influential book about economics written since Adam Smith's Wealth of Nations. Government policy makers are Keynesians.

Arguably, the best rebuttal to Keynes is Ludwig von MIses' Human Action. Mises' view is more of a free-market, neo-classical approach.