By Hans Toch. Perceptual and Motor Skills. 1963, 16, 621-628.
By Malcolm S. Maclean, Jr. • Hans H. Toch. Audio-Visual Communication Review Volume 7, Number 2, Spring 1959. 11p.
By Hans Toch and Malcolm S. MacLean, Jr.. Audio-Visual Communication Review. September-October 1962 Vol. 10, No. 5.