if you log onto webct,
www.webct.unsw.edu.au, and look at your course outline it should have the name of the prescribed textbook for your course and the recomend books
most of the time they will make you buy the latest edition and for example my Finance course this year released a new 2005 edition of the textbook and in the course outline the lecture in charge wrote
There are some minor but significant differences between the 3rd and 4th edition of the prescribed text book. Therefore it is advisable to purchase the 4th edition. If you opt to use the third edition, this will be at your own risk.
and in another course
... Note: Earlier editions are not acceptable.
my advice, buy the latest edition if you are going to use it....if you are not a textbook person and just want to rely on everything that comes out of the lecturer's mouth, then older books will do
btw, you will find that most first year course will have a new edition out every year because so many people do the course publishers can make a lot of money out of it
okie