 Jacqueline_Simpson  The Folklore of Discworld with Terry Pratchett, Doubleday 2008 ISBN 978-0-385-61100-8. 2nd, enlarged edition. Corgi 2009 ISBN 978-0-55215-493-2. 3rd enlarged edition, Corgi 2014 ISBN 978-0-552-15493-2 same ISBN as 2nd edition 