MacKayC. K.BrazeudaleA. H.WilsonL. F.Concepts of horizontal and vertical: A methodological note. Developmental Psychology, 1972, 7, 232–237.
2.
SchnallM.AlterE.SwanlundT.SchweitzerT.A sensory-motor context affecting performance in a conservation task: A closer analogue of reversibility than empirical return. Child Development, 1972, 43, 1012–1023.
3.
ThomasH.Age trends and sex differences in judgment of the horizontal. Paper presented at the meetings of the Society for Research in Child Development, Minneapolis, Minnesota, March, 1973.
4.
WillemsenE.ReynoldsB.Sex differences in adults' judgments of the horizontal. Developmental Psychology, 1973, 8, 309.