References
- Berko , Jean . 1958 . The child's learning of English morphology . Word , 14 : 150 – 77 .
- Ervin , Susan M. 1966 . “ Imitation and structural change in children's language ” . In New directions in the study of language , Edited by: Lenneberg , Eric H. 163 – 89 . Cambridge, Mass. : M.I.T. Press .
- Leopold , Werner . 1953–4 . Patterning in children's language learning . Language Learning , 5 : 1 – 14 .