Online encyclopaedias are great for short, concise and correct information. Search by your historical event e.g. Titanic.
It is important that you 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 provided on this page would look like:
Eva Hart speaks about her memories of the Titanic . . survivor interview (2010). Available at: https://youtu.be/MD5J43Z9AWI [Accessed 4 Feb. 2016].
Stewart, A 2012, Titanic unclassified : secrets of the Titanic revealed, A & C Black,London.
Titanic 2016. Britannica School. Retrieved 4 February 2016, from http://school.eb.com.au/levels/middle/article/313853