A book has a title, an ISBN number, a language it was written in, and the total number of pages. An author has a name and a place of origin. An author writes a book. A book is written by one author and an author writes 1 to many books. A publisher has a name, a city and a country. A publisher releases a book on behalf of the book's author. A publisher can release many books but a book is released by 1 publisher. A book has a title, an ISBN number, a language it was written in, and the total number of pages. An author has a name and a place of origin. An author writes a book. A book is written by one author and an author writes 1 to many books. A publisher has a name, a city and a country. A publisher releases a book on behalf of the book's author. A publisher can release many books but a book is released by 1 publisher