Numerical referencing: citing in the body of the text
When you cite a piece of work from any source of information such as a book, webpage and so on, you use a number which will correspond with the full details of the source. The full details will be written in your foot/end note list. You can use brackets or superscript, but do not switch between the two; always use the same format and be consistent.
Example 1: brackets
The report  emphasises that the research done by Holstein was in direct conflict with that produced by Greene.
Example 2: superscript
The report1 emphasises that the research done by Holstein was in direct conflict with that produced by Greene.
Example 3: information from several sources
It has been proven that the research in this area is inconclusive1,3, 4-8 however Smith9declares...
If you are using Microsoft Word you can either use the 'footnote' function, position your cursor where you want the number to be, then click on Insert / Referencing / Footnote
Type a number and highlight it, then click on Format / Font / Superscript