Texts

Harris and Oliver, International Commercial Tax (CUP)
Van Raad (ed), Materials on International and EU Tax Law (latest ed)

International Books

Arnold and McIntyre, International Tax Primer (2002)
Ault et al, Comparative Income Taxation (3rd ed)
Baker, Double taxation conventions: a manual on the OECD Model Tax Convention on Income and on Capital
Farmer and Lyal, EC Tax Law
Ogley, Principles of International Tax
Vogel on Double Taxation Conventions

Statutes

Butterworths Yellow Tax Handbook (latest ed) or
CCH Tax Statutes (latest ed)