retrieves book information for a given ISBN. Returns an XML schema containing title, author, publisher, pubdate and other info. retrieves an array of bookInfo (author, title, isbn) given a keyword. Vendor price data is not provided in the elements of the array. retrieves an array of bookInfo (author, title, isbn) given a keyword. Vendor price data is not provided in the elements of the array. User may specify the source website (either Bookshop.co.uk or Barnes & Noble). retrieves book information for a given ISBN. Returns an XML schema containing title, author, publisher, pubdate and other info. retrieves an array of bookInfo (author, title, isbn) given a keyword. Vendor price data is not provided in the elements of the array. retrieves an array of bookInfo (author, title, isbn) given a keyword. Vendor price data is not provided in the elements of the array. User may specify the source website (either Bookshop.co.uk or Barnes & Noble). retrieves book information for a given ISBN. Returns an XML schema containing title, author, publisher, pubdate and other info. retrieves an array of bookInfo (author, title, isbn) given a keyword. Vendor price data is not provided in the elements of the array. retrieves an array of bookInfo (author, title, isbn) given a keyword. Vendor price data is not provided in the elements of the array. User may specify the source website (either Bookshop.co.uk or Barnes & Noble).