Supplementary reading

Distributed Systems - Principles and Paradigms

by Andrew S. Tannebaum and Maarten Van Steen
second edition, Pearson Education, ISBN: 0-13-239227-5

This book could equally well have been chosen as the course book. It covers more or less the same material.

Distributed Computing - Principles, Algorithms, and Systems

by Ajay D. Kshemkalyani and Mukesh Singhal
Cambridge Univeristy Press, ISBN: 978-0-521-87634-6

A book that is more theoretical than the course book. The book covers topics that are handled in the advanced course. If you think that the theory is the most important part of distributed systems and know the basics of networks and programing systems this could be the book for you.
Programming Erlang - Software for a Concurrent World

by Joe Armstrong
the Pragmatic Programmers, ISBN: 987-1-934356-00-5

This is the book if you want to go further in Erlang programming. There is of course a lot of material on the web but why not take it from one of the most experienced Erlang programmer.
Erlang Programming - A Concurrent Approach to Software Development

by Francesco Cesarini, Simon Thompson
June 2009
O'Reilly, ISBN 10: 0-596-51818-8 | ISBN 13: 9780596518189

The lates addition to Erlang books, now by the people who might have the most experience in teaching Erlang: Francesco from Erlang Training and Consulting and Simon from the University of Kent.