About > Our Guarantee

All our books come with an unconditional guarantee.

If you are not completely satisfied with a book for any reason, please let us know -- we will gladly issue a full refund or an exchange, regardless of where you purchased the book.

Our books are sold to bookstores on a "firm sale" basis, so your bookstore may or may not accept returns themselves (depending on their own policy).

However, do not worry---you can always return a book directly to us and we will refund the full cost of the book and return shipping. To begin the returns process, please send us a fax or email with details of your purchase and why you are disappointed (contact information).

If a bookstore incorrectly sends you an old version of a book after we have released a new version, just contact us and we will replace it with the latest version free of charge.

If there is a production issue with any book (e.g. damaged cover, missing pages) your bookstore can obtain a replacement from their wholesale supplier for you, free of charge. If there are problems getting them to do this, let us know and we will ship a replacement copy to you immediately.

If you've purchased one of our books and find an error in it you can report it to us and we will submit a patch to the maintainer. If the error was not previously listed on this website you'll be entitled to a free copy of the next edition when it is published.

Brian Gough
June 2003 (updated September 2004, March 2007)
Network Theory Ltd