v. 1. Early work (pre-1980)
v. 2. The null-subject parameter
v. 3. Head-complement order
v. 4. Wh-movement
v. 5. Verb movement
v. 6. Further issues.
Comparative grammar : critical concepts in linguistics. ISBN 9780415342056. Published by Routledge in 2007. Publication and catalogue information, links to buy online and reader comments.