Internet, le 26-03-2005, http://en.wikipedia.org
Information trouvée : Sir John Grahame Douglas Clark (1907 -1995) was a British archaeologist most notable
for his work on the Mesolithic and his theories on palaeoeconomy.
Prehistory at Cambridge and beyond / Grahame Clark, 1989
http://homepages.stmartin.edu/fac_staff/dprice/deadbook.htm, 2004-04-14