Fraser 2008. Fraser, Don (May 25, 2008). "Vision On". Bridge Design & Engineering (51). London: Hemming Information Services. Archived from the original on September 24, 2010.
Fraser 2008. Fraser, Don (May 25, 2008). "Vision On". Bridge Design & Engineering (51). London: Hemming Information Services. Archived from the original on September 24, 2010.