References
- Gundlach , C. and Macoubrey , C. 1931 . The effect of color on apparent size . Amer. J. Psychol , 43 : 109 – 111 .
- Walsh , J. W. T. 1926 . Photometry , New York : Van Nostrand .
- Warden , C. J. and Flynn , E. L. 1926 . The effect of color on apparent size and weight . Amer. J. Psychol , 37 : 398 – 401 .