To find a book, click on the appropriate contents section in the frame on the left and scroll through the list of books that appears in this frame. They are arranged alphabetically by author's surname. By clicking on a book you can ascertain its availability, its (possibly discounted) price and, if you so wish, you may order it. Doing so helps to support The Astronomical Unit web site.
I have specifically recommended those books which I think are worthy of it, but please remember that the comments about the books are opinions and that yours may differ.
.If you cannot find what you want, clicking on Search in the left hand frame will return you to this page and the link below, through which you can search the Amazon.co.uk extensive database.
You may also find that a book not in print in the UK is available in the USA – click on the link to Astronomy Books (USA) in the frame on the left if you wish to try this option.