Blair, Alastair. "Robert Campbell". perthstjohnstonefc.co.uk. St Johnstone FC. Archived from the original on 12 October 2014. Retrieved 26 November 2013.
Blair, Alastair. "Robert Campbell". perthstjohnstonefc.co.uk. St Johnstone FC. Archived from the original on 12 October 2014. Retrieved 26 November 2013.