title: linq query with many-to-many relationship
body: <p>Let’s assume I have three tables in my database: </p>
  
  <pre><code>Authors(PK Id, AuthorName) 
  Books(PK Id, BookName) 
  Authors_Books(FK BookId, FK AuthorId)
  </code></pre>
  
  <p>I need to write a method which passes in a parameter int[] authorsIds and returns all books (Id, BookName, list of authors of this book) if it was written by any author whose Id contains in int[] authorsIds parameter.</p>
  
  <p>I need LINQ query (query method).</p>
  
  <p>I really need a help. Appreciate your help very much.</p>