Our grateful thanks are due to the very many individuals and organisations involved in the construction of this website. In particular we would like to thank:
Geoff Woodward, Andrew Holland and Mike Miles for writing the OCR exam help material.
Robin Bunce, Laura Williams, Jane Barnard, Adam Bloomfield, Peter Donaldson, Mark Gosling, Ben Gregory, Alison Gundy and Vanessa Musgrove for writing the Edexcel exam help material.
John Laver, Chris Rowe, Rob Whitfield and David Ferriby for writing the AQA exam help material.
We very gratefully acknowledge kind permission from their publishers to reproduce short passages from the following books and articles: