Online encyclopaedias are great for concise and correct overviews.
It is important to show your teacher you used a variety of reliable resources. Use the online Reference Generator available through the Portal to create your citations. Make sure you alphabetically sort them afterwards.
A sample bibliography for 3 resources listed on this page would look like:
2012, Government in Australia, Pearson, Port Melbourne.
Google Search Operators & Commands n.d., Chart, SlideShare, accessed 14 September 2016, http://image.slidesharecdn.com/googlesearchoperatorlix-ray-140923031955-phpapp02/95/google-search-operator-li-x-ray-2-638.jpg?cb=1411442897.
National Library of Australia n.d., TROVE, Australian Government, accessed 14 September 2016, <http://trove.nla.gov.au/>.