Mathematics for elementary teachers : a conceptual approach / Bennett, Albert B. Nelson, Leonard T. Mathematics. 510 MCG 2004 A059 Or. Boston : McGraw-Hill Higher Education, c2004. c2004. Text xii, 875 p. : http://www.loc.gov/catdir/description/mh031/2002015191.html http://www.loc.gov/catdir/toc/mh031/2002015191.html