| Original language | English (US) |
|---|---|
| Pages (from-to) | 337-345 |
| Number of pages | 9 |
| Journal | Journal of child language |
| Volume | 5 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jun 1978 |
| Externally published | Yes |
Bibliographical note
Funding Information:[•] Work on this paper was partly supported by grant HD 09112-02 to the first author and NIH grant 5 TOi MH 06668 to the second author. Some of the data cited in the paper comes from analyses of longitudinal data collected by Professor Roger Brown and his associates. The authors gratefully acknowledge their appreciation for his permission in this matter. First author's address: Institute of Child Develop-ment, University of Minnesota, Minneapolis, Minnesota 55455.