1. Verhoeff, F. H. Binocular perspective. Amer. Jour. Physiol. Optics, v. 6, no. 3.
2. Visual phenomena and their stimulus correlations;Troland;Found. Exp. Psych.,1929
3. A comparison of the ocular characteristics of unselected and reading disability groups;Eames;Jour. Educ. Res.,1932
4. The sterescopic development of the fusion faculty. American Optical Co., 1928, pp. 31—32.
5. Unselected cases were obtained through the cooperation of Superintendent Frank A. Scott, Miss Eleanor Hayes, and Mr. Rush of the Belmont, Massachusetts, School Department.