R. W. Pickford

Personality assessment: a critical survey.

R. W. Pickford, 1964 .

A STUDY OF THE ISHIHARA TEST FOR COLOUR BLINDNESS1

R. W. Pickford, 1949 .

Human Senses and Perception.

R. W. Pickford, D. W. Hamlyn, G. M. Wyburn, 1966 .

Psychology and Visual Aesthetics

R. W. Pickford, Marc H. Bornstein, 1973 .