Answered By: Carole Rhodes Last Updated: Aug 13, 2015 Views: 818
If you're using the Harvard style and you need to refer to two or more sources at the same time, separate them by semicolons. Cite the most recent work first, e.g. "Reviews of the literature (Smith, 2012; Jones, 2010; Bates and Andrews, 2008) indicate that..."
For more information, see the Referencing guide.