case class Book(title: String, authors: List[String]) 


val books: List[Book] = List( 
  Book("Structure and Interpretation of Computer Programs", 
       List("Abelson, Harold", "Sussman, Gerald J.")), 
  Book("Principles of Compiler Design", 
       List("Aho, Alfred", "Ullman, Jeffrey")), 
  Book("Programming in Modula-2", 
       List("Wirth, Niklaus")), 
  Book("Introduction to Functional Programming", 
       List("Bird, Richard")), 
  Book("The Java Language Specification", 
       List("Gosling, James", "Joy, Bill", "Steele, Guy", "Bracha, Gilad")))