C++ program involving 3 classes

If you are asked to write three classes : class Person, BookAuthor, and Book.  The class Person involves with a person's identity. The class BookAuthor involves with a collection of books or book titles. The class Book involves  number of books in stock , book title, and price. Design the three classes .  The classes must use appropriate relationships.   Each class must have two constructors, one is the default and the other is an overloaded constructor.  Each class has at least two private data members.