The ModulaTor Technical Publication 
72 issues of The ModulaTor: Articles about the programming languages Oberon-2 and Modula-2: programming examples, implementation notes, language comparisons, and language design.
http://www.modulaware.com/mdltr_.htmEDM/2 - A Discussion of Oberon
A Discussion of Oberon and Component Pascal.
http://www.edm2.com/0608/oberon.html
ETH Oberon Module Definitions
Browse the auto-generated module definitions for the Oberon System 3 Versions.
http://www.oberon.ethz.ch/ethoberon/defs/
The Oberon Programming Language: Hello World!
The Oberon Programming Language - information at University of Michigan.
http://www.engin.umd.umich.edu/CIS/course.des/cis400/oberon/oberon.html
ETH Zürich / Oberon Bibliography
Oberon Bibliography
http://www.oberon.ethz.ch/books.html
Object-Oriented Programming in Oberon-2
Tutorial with history, descriptions, code samples, references.
http://statlab.uni-heidelberg.de/projects/oberon/kurs/www/Oberon2.OOP.html
Oakwood Guidelines
A companion to the O2 language report which clarifies issues for compiler writers and users.
http://smalllinux.sourceforge.net/oberon/oakwood.htm
Brighton University Resource Kit for Students: Oberon
Links and information at BURKS.
http://burks.bton.ac.uk/burks/language/oberon/
