In APA style, the preferred term is Reference List.
IB requires you to reference all the sources you use in the Reference List. You should not include items you have not used in your essay.
Here is a sample paper provided by the APA which has been fully annotated to explain all the citation elements. Well worth looking at before you start.
Go to the tab "APA posters" to see how to reference images, articles, websites and books.
This guide was created and maintained by Dr. Anthony Tilke, 2013-2015. Updates have been maintained by Kurt Wittig, 2015-2016.