Documentation styles e.g. IEEE and APA
If you are not sure how to correctly cite and refer to your sources, this document will tell you the requirements for different documentation styles.
In APA format, you should cite within a text rather than using footnotes or endnotes.
IEEE uses endnotes for references. Mark the citation in the text with a number in square brackets.  At the end of the text, compile a list of references, noting each with the appropriate number (still in square brackets).