Skemp, Richard R, The psychology of learning mathematics / [print] Richard R. Skemp. - Expandedition. American edition. - Hillsdale, New Jersey : L. Erlbaum Associates, (c)1987. - ix, 218 pages : illustrations ; 24 cm. LCCN: 87006767 Subjects--Topical Terms: Mathematics--Study and teaching. LC Class. No.: QA11 QA11.S627.P793 1987