It's hard to say.
Junit In Action 1st ed introduces junit and covers junit 3.8.1 and maven,
Junit In Action 2nd ed introduces junit and covers junit 4.5 and maven2
Junit recipes is based on junit 3.8.1 but contains good testing tips
Keep in mind that junit now goes in version 4.10
Maybe "Pragmatic Unit Testing in Java with JUnit (2004)" can be a good choice, but I have not read it
http://media.pragprog.com/titles/utj/contents.pdf
If you want to test with spring then:
"Spring recipes" covers junit 3 and 4 spring tests
Spring in action 2d covers also spring tests
If you want to learn TDD, read Part 1 of "Test Driven: Practical TDD.."
HTH..