For example of what not to do, see a recent post: http://www.weliveinbeijing.com/discussion/thread.rails?Tid=1000002812
The author fails to note that his post simply reposts this article: http://hi.nciku.com/space.php?uid=6675&do=blog&id=2398
and instead treats it as his own work.
For other examples, try googling any comprehensible English posts by user "Yes Sir".
For examples of proper quoting of others materials, see any news articles posted by user "Sun".