title: Asking questions of retarded persons: a comparison of yes-no and either-or formats.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002755:Choice Behavior; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology*; D007407:Interviews as Topic / Q000379:methods*; D008297:Male; D012718:Set, Psychology; D011795:Surveys and Questionnaires