3de Haan, E Postmodifying clauses in the English noun phrase. A corpus-based study[M]. Amsterdam: Rodopi. 1989: 85.
4Beaumont, Clare. Reading Relative Clauses. Journal of Research in Reading[J]. 1982 ( 1 ): 29-42.
5Keenan, Edward L. Bernard Comrie. Noun phrase accessibility and universal grammar[J]. Linguistic Inquiry. 1977 ( 8 ): 63-99.
6Kuno, Susumu. The position of relative clauses and conjunctions[J]. Language.Inquiry. 1974 ( 1 ): 117-137.
7Hamilton, Robert L. Is Implicational generalization unidirectional and maximal? Evidence from relativization instruction in a second language[J]. Language Learning. 1994 ( 1 ): 123-157.
8Brown, H. Douglas. Children' s comprehension of Relativized English sentences[J]. Child Development. 1971 ( 42 ): 1923-1936.
9Sheldon, Amy. The acquisition of relative clauses in French and English: Implications for language-learning universals[A] Eckman, Fred. Ed. Current themes in linguistics. Bilingualism, experimental linguistics and language typology[C]. Washiongton: Hemisphere Publishing Coporation. 1974: 49-61.
10Gass, Susan. Language Transfer and Universal Grammatical Relations[J]. Language Learning. 1979 ( 2 ): 327-344.
