References
- Blank, H. Robert: Psychoanalytic considerations for professional workers in the prevention of blindness, J. Social Casework, 36:319–323 (July) 1955.
- Gesell, Arnold Lucius: The First Five Years of Life; a Guide to the Study of the Preschool Child, New York and London, Harper, 1940.
- Gesell, Arnold Lucius, and Ilg, Frances L.: The Child from Five to Ten, New York and London, Harper, 1946.
- Grinker, Ray R., and Robbins, Fred: Psychosomatic Case Book, New York, Blakiston, 1954, p. 128.
- Josselyn, Irene Milliken: Psychosocial Development of Children, New York, Family Service Assn. of America, 1948, p. 8.
- Lancaster, Julia E.: A Manual of Orthoptics, Springfield, Ill., Charles C Thomas, 1951, p. 8.