IEEE Citation Guide: In Text Citations

• When you mention a source in your report, put a number in square brackets right there in the text (e.g., [1]).
• Assign numbers to your sources based on the order in which you first cite them in your writing.
  • The first source you use will be [1] the second will be [2] the third will be [3] and so on.
• If you refer to the same source again, use the same number as before.
  • The first source will always be represented as [1] 
• Each reference number should be enclosed in square brackets on the same line as the text, before any punctuation, with a space before the bracket.

Citing more than one reference at once:

• List each reference number separately with a comma or dash between each reference
  • Ex. 
    • [1], [3],[7]
  • or
    • [1,3,7]
  • or
    • [1]-[5]

From The University of Western Australia