Katherine Sierra & Bert Bates.
SCJP Sun Certified Programmer for Java 6 Study Guide.
McGraw-Hill, 2008.
ISBN: 0071591060
Joshua Bloch.
Effective Java, Second Edition.
Prentice Hall, 2008.
ISBN: 0321356683
Khalid Mughal & Rolf Rasmussen.
A Programmer's Guide to Java SCJP Certification, Third Edition.
Addison-Wesley, 2008.
ISBN: 0321556054