Have you considered using bibliographic software such as Refworks to collect, organise and manage your references?
This software enables you to import source information to a web-based tool and organise it into folders. When you are typing your assignment, dissertation or thesis in Microsoft Word you can then automatically incorporate citations and create a bibliography in the style of your choice eg Harvard.
Refworks is a tool that can really simplify the research and writing process for both undergraduate and postgraduate students. No more worries about lost references!
To access Refworks go to the referencing webpage at: http://www.surrey.ac.uk/library/learning/informationskills/referencing.htm where you will find links to Refworks and some useful guidance on how to use it.