In my opinion it's impossible to effectively manage a project without EVPM. The best book on the topic is Earned Value Project Management by Quentin W. Fleming, Joel M. Koppelman. See my 18 March 2001 Amazon review for why I think this book is the best.
There are also five articles that every project manager should read:
- Earned Value Project Management: An Introduction
- Earned Value Project Management: A Powerful Tool for Software Projects
- Gaining Confidence in Using Return On Investment and Earned Value
- Applying Management Reserve to Projects
- Impact Estimation Tables: Understanding Complex Technology Quantitatively
If you are at an advanced level in project management, I recommend that you read an article by Dr. Barry Boehm et al. on schedule as an independent variable (SAIV), cost as an independent variable (CAIV), and schedule-cost-quality as independent variables (SCQAIV).