A good meta-analysis of the research is in the paper:
Griffiths, Y & Stuart , M (2013) 'Reviewing the evidence-based practice for pupils with dyslexia and literacy difficulties' Journal of Research in Reading 36 (1) pp96-116.
Eikeseth, S. (2011). Intensive Early Intervention. 321-338. doi: 10.1007/978-1-4419-8065-6_20
Pagliano, P. J. (2006). Remediation of Language Disorders in Children. In B. Editor-in-Chief: Keith (Ed.), Encyclopedia of Language & Linguistics (Second Edition) (pp. 535-538). Oxford: Elsevier.
Tzouriadou, M., Barbas, G., Vouyoukas, C., & Anagnostopoulou, E. (2013). The relationship between language and social competence in high-risk preschoolers. Advances in mental health and intellectual disabilities, 7(4), 6-6.
Thanks Fran. All resources contribute to our knowledge. From my 18 years teaching experience all children become readers but those with developmental delays start reading 1 or two years later than their peers. In some cases early intervention prevents dyslexic children from struggling to learn phonics in elementary school but if a specific language disorder is present they need intensive programs in Reading for understanding vocabulary and grammar.