1. Developmental sequences: The emergence of aspect marking in second language acquisition;Andersen,1991
2. How children talk about what happened;Antinucci;Journal of Child Language,1976
3. Bioprograms and the innateness hypothesis;Bates;Behavioral and Brain Sciences,1984
4. Roots of language;Bickerton,1981
5. The development of English aspectual systems: Aspectualizers and post-verbal particles;Brinton,1988