There is an excellent book on programming in Erlang simply called Programming in Erlang. It deals quite a lot with Erlang's concurrency model and how to write concurrent programs. Cremona is known to sell it at occasions. Great book!
There are many other books on multithreaded programming in Java that you could refer to, and are easily found on the web. For example, a comparative review of 6 books. The focus of these books differs somewhat from that of our course.
Some quick comments on two books.
Concurrent Programming in Java, Second Edition, by Doug Lea (Addison-Wesley) is both advanced and detailed, and has a computer science perspective as well as a practical one.
Multithreaded Programming with Java Technology, by Lewis and Daniel Berg (Prentice Hall, Sun Press) presents lots of low-level and implementation detail, and is written more from a practical programmer's point of view.
Many Java books have a brief chapter on concurrency. A fair example is the chapter in Object-Oriented Software Development Using Java, by Xiaoping Jia, Addison Wesley.
The online book Learn You Some Erlang For Great Good is also an excellent resource for beginning Erlang programmers.