Duffy, Paul (Winter 2004). "Deeply Challenging"(PDF). Inland Waterways News. Archived from the original(PDF) on 3 March 2016. Retrieved 15 September 2014.
Duffy, Paul (Winter 2004). "Deeply Challenging"(PDF). Inland Waterways News. Archived from the original(PDF) on 3 March 2016. Retrieved 15 September 2014.