Law, James; Garrett, Zoe; Nye, Chad (2003년 7월 21일). “Speech and language therapy interventions for children with primary speech and language delay or disorder”. 《Cochrane Database of Systematic Reviews》 (영어) (3): CD004110. doi:10.1002/14651858.cd004110. PMID12918003.
Law, James; Garrett, Zoe; Nye, Chad (2003년 7월 21일). “Speech and language therapy interventions for children with primary speech and language delay or disorder”. 《Cochrane Database of Systematic Reviews》 (영어) (3): CD004110. doi:10.1002/14651858.cd004110. PMID12918003.