Before revision: Mathematics Learning Study Committee Edition: illustrated Published by National Academies Press, 2001 ISBN 0309069955, 9780309069953 "Capacity for logical thought, reflection, explanation and justification."
After revision: Mathematics Learning Study Committee Edition: illustrated Published by National Academies Press, 2001 ISBN 0-309-06995-5, 978-0-309-06995-3 "Capacity for logical thought, reflection, explanation and justification."