"'La logique et l'intuition dans la science mathématique et dans l'enseignement' ('Logic and intuition in the science of mathematics and in teaching')". Book by Henri Poincare, 1899.
Massachusetts. Board of Education, Horace Mann (1849). “The Massachusetts System of Common Schools: Being an Enlarged and Rev. Ed of the Tenth Annual Report of the First Secretary of the Massachusetts Board of Education”, p.113