There are an increasing number of online resources that provide access to primary source material, i.e. original documents. The following may be of interest:
In general, books and journal articles will be the main sources of information for your academic work. However, a number of other reliable sources of information are available. These include:
Conference Papers - academic papers presented at conferences
Working Papers - pre-publication academic research papers
Official Publications - publications by national governments and IGOs
Exam Papers - Searchable collection of past exam papers
Use the drop-down links under the Other Resources tab for more information.