Klugh, H E Discrimination learning by retardates and normals: method of presentation and verbalization. [electronic resource] - American journal of mental deficiency May 1966 - 903-6 p. digital Publication Type: Journal Article ISSN: 0002-9351 Subjects--Topical Terms: AdultChildChild, PreschoolDiscrimination LearningHumansIntellectual DisabilityMiddle AgedVerbal Behavior