http://www.level2.phys.strath.ac.uk/ScienceOnStreets/jameswatt.html
http://www.geocities.com/Athens/Acropolis/6914/watte.htm
http://www.spartacus.schoolnet.co.uk/Scwatt.htm
http://www.ideafinder.com/history/inventors/watt.htm
http://www.geschichte.2me.net/bio/cethegus/w/watt.html

Books

See his correspondence, Partners in Science, ed. By E. H. Robinson and D. McKie (1970); study by E. H. Robinson and A. E. Musson (1969).