Martin, G. E., Losh, M., Estigarribia, B., Sideris, J., & Roberts, J. (2013). Longitudinal profiles of expressive vocabulary, syntax, and pragmatic language in boys with Fragile X syndrome or Down syndrome . International Journal of Language & Communication Disorders , 48 (4), 432–443. https://doi.org/10.1111/1460-6984.12019
Martin, G. E., Losh, M., Estigarribia, B., Sideris, J., & Roberts, J. (2013). Longitudinal profiles of expressive vocabulary, syntax, and pragmatic language in boys with Fragile X syndrome or Down syndrome. International Journal of Language & Communication Disorders, 48(4), 432–443. https://doi.org/10.1111/1460-6984.12019
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http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=3926422&tool=pmcentrez&rendertype=abstract