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, Five Thousand Quotations for All Occasions, edited by Lewis C. Henry, Doubleday & Co., 1945, March 18, 2005
Izard, Teaching Class, Jan.5, 2005
ROUSSEAU, Chantal et autres. Guide Méthodologique, Campbell River, école Phoenix Middle school, p.79
BrainConnection: The Brain and Learning, page consulted on 6 march 2005.) Address http://www.brainconnection.com/