6Reilly S, Wake M, Bavin EL, et al. Predicting language at 2 years of age: a prospective community study. Pediatrics, 2007, 120(6):1441- 1449.
7Dae PS, Price TS, Bishop DV, et al. Outcomes of early language delay: I. Predicting persistent and transient language difficulties at 3 and 4 years. J Speech Lang Hear Res, 2003, 46(3):544-560.
8Buschmann A, Jooss B, Rupp A, et al. Children with developmental language delay at 24 months of age: results of a diagnostic work-up. Dev Med Child Neurol, 2008, 50(3):223-229.