Draw the ER diagram for a local bookstore database based on the following information: $1.$ Each book has a title, abstract$,$ and ISBN. The ISBN is unique to each book; $2.$ Some of these books are computer$-$science textbooks, in which case there is an additional piece of associated information $$ the programming language used for instruction in the book $3.$ One book may cite other books, and may be cited by other books as well; $4.$ Each book is published by a publisher although such publisher information may not always be available in the database; $5.$ A publisher has a unique name, as well as a city and year of the establishment; $6.$ Each book is written by one or more authors. An author must have written at least one textbook to be included in the database; $7.$ An author has a name, an address and an SSN$.$ The SSN is unique to each author. Remember to indicate the key for each entity, as well as the multiplicity of each relationship $($e$.$g$.$ one$-$to$-$many$)$ and the referential integrity constraints, using the appropriate notation.