1. Angermaier M (1974) Sprache und Konzentration bei Legasthenie. Hogrefe, Göttingen
2. Gupta R, Ceci SJ, Slater AM (1978) Visual discrimination in good and poor readers. J Spezial Education 12:(4) 409–416
3. Under M (1951) Cber Legasthenie. Zeitschrift für Kinderpsychiatrie 18:97–143
4. Malmquist E (1958) Factors related to reading disabilities in the first grade of the elementary school. Dissertation Uppsala, Almquist & Wiksells
5. Mattis S (1978) Dyslexia syndromes: a working hypothesis that works. In: Benton AL, Pearl D (Hrsg) Dyslexia: an appraisal of current knowledge. Oxford University Press, New York