PLEASE CODE THIS CLASS (I DID ALL THE REST OF CLASSES):

PLEASE CODE THE ABOVE CLASS IN C++ & COMMENT ON EVERY LINE YOU WRITE :)

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); Create a class called Reference Manager that will be used as a container to hold objects of classes Article, Book, and TextBook. 1. Reference Manager has a fixed capacity. It uses a fixed size array to store References. 2. The first reference added to the container will be added at position zero, the second one at position 1, and so on. A reference is always added at the next available position; 3. A Reference Manager has one regular constructor: Reference Manager(int capacity). The constructor must create an array of size capacity, which will be used to store References. It will also initialize the instance variables that your implementation requires. 4. Reference Manager will have size data member, which will track the number of references in the array. 5. bool add(Reference & reference): adds a reference at the next available position and returns true, or returns false if the reference manager is full. 6. int get(int pos): returns the identifier of the Reference object stored at position pos of the Reference Manager. You can assume that pos is a valid index, i.e. 0