by Giray, E F, Altkin, W M, Roodin, P A, Vaught, G M
Published in Perceptual and motor skills (01.02.1977)

by Giray, E F, Altkin, W M, Barclay, A G
Published in Perceptual and motor skills (01.08.1976)

by Barclay, A G, Giray, E F, Altkin, W M
Published in Perceptual and motor skills (01.04.1977)

by Giray, Erol F., Altkin, Warren M., Vaught, Glen M., Roodin, Paul A.
Published in Child development (01.12.1976)