Allow me to quote from wikipedia: "The Harvard style is the most commonly-used style of referencing worldwide. Unfortunately, it is not 'owned' by any institution or organisation, so no authority sets the rules. This means they have been interpreted slightly differently by different institutions." So, you can go online and run a Google search to find out some of the most common Harvard styles, and simply follow that format, but you still might be wrong. The only way you can be absolutely sure you are using the Harvard variation that your professor expects is to ask your professor, or some one else at your university, what version your institution employs.
Sean, EssayForum.com