Nigel Harcourt-Brown and John Chitty are the authors of BSAVA Manual of Psittacine Birds, 2nd Edition, published by Wiley.
The Manual is extremely well produced, provides readable access to valuable information on a large group of distinctive birds and, apart from being a must for every small animal veterianry practice, it would make an important addition to the shelves of any serious parrot-keeper or rescue group. Ibis, 2006