Chapter 2 'Null objects in Italian and the theory of pro' is reprinted from Linguistic Inquiry, 17:501-57 by permission from MIT Press.
Chapter 5 'On chain formation' is reprinted from H. Borer (ed.) The Syntax of Pronominal Clitics, Syntax and Semantics 19, 1986:65-95, by permission from Academic Press.
Chapter 6 'On the anaphor-agreement effect' is reprinted from Rivista di Linguistica 2, 1, 1990:27-42 by permission from Rivista di Linguistica, Pisa.
Chapter 9 'Residual verb second and the Wh Criterion' is reprinted from A. Belletti and L. Rizzi (eds) Parameters and Functional Heads, 1996:63-90, by permission from Oxford University Press.
Chapter 10 'The fine structure of the left periphery' is reprinted from L. Haegeman (ed.) Elements of Grammar, 1997:281-337 by permission from Kluwer Academic Publishers.
Chapter 11 'Early null subjects and root null subjects' is reprinted from T. Hoekstra and B. Schwartz (eds) Language Acquisition Studies in Generative Grammar, 1994:151-76 by permission from John Benjamins Publishing Company.
Chapter 12 'Some notes on linguistic theory and language development: the case of root infinitives' is reprinted from Language Acquisition, 3, 4, 1993/94:371-93 by permission from Lawrence Erlbaum.