Guglielmo Cinque 
Typological Studies [PDF ebook] 
Word Order and Relative Clauses

In this book, Cinque takes a generative perspective on typological questions relating to word order and to the syntax of relative clauses. In particular, Cinque looks at: the position of the Head vis a vis the relative clause in relation to the position of the verb vis a vis his object; a general cross-linguistic analysis of correlatives; the need to distinguish a sentence-grammar, from a discourse-grammar, type of non-restrictives (with languages differing as to whether they possess both, one, the other, or neither); a selective type of extraction from relative clauses; and a tentative sketch of a more ample work in progress on a unified analysis of externally headed, internally headed, and headless relative clauses.