Code in C++ please, and add some comments to understand, thank you.

Q1. Class Reference (10 marks) Implement a class, called Reference, to represent the characteristics that are common to all the References. Namely, 1. All references must have a unique identifier (of type int). 2. All references have a title and author (both of type string or char*), as well as year of publication (of type int); Key Notes: All the classes should have At least a default constructor, a copy constructor and a destructor Accessing functions A print function