I really need help.

i previously posted a problem regarding aggregation and inheritance. Look at the user defined constructor and please tell me if im correct with the Publisher object. There is a main file which calls the BookItem constructor like this:
BookItem text1("Author", "Title", Publisher("Publisher's name")), 2002);
I dont know how to create the Set and GetPublisher() functions, i want to be able to set and get the Publisher's name. Can someone please help me. Someone was helping me but i still cant get it right.
I have a
SetPublisher(Publisher pubTemp){
delete pub;
pub = new Publisher(pubTemp);
//initialise the copy constructor
}
The GetPublisher returns a string or a class type, not sure?
i done a bit of extra work on the assignment operator overloading as well, not sure if thats right, too
please, get me out of this mess????

#include<iostream>
#include<string>

   using namespace std;

#include "BookItem.h"
#include "StockItem.h"


// USER DEFINED CONSTRUCTOR

    BookItem::BookItem(string Authors, const string &Title, Publisher
     pubTemp, int Year = 0)
    :StockItem(Title)
    {
     pub = new Publisher(pubTemp);

      this->SetAuthors(Authors);
      this->SetTitle(Title);
// this->SetPublisher(pub);
      this->SetYear(Year);
   }

   string BookItem::GetAuthors() const
   {
      return(this->Authors);
   }

    string BookItem::GetTitle() const
   {
      return(this->Title);
   }

     string BookItem::GetPublisher() const
       {
         return("");
        }

    int BookItem::GetYear() const
   {
      return(this->Year);
   }

    void BookItem::SetAuthors(string Authors)
   {
      this->Authors = Authors;
   }

    void BookItem::SetTitle(const string &Title)
   {
      this->Title = Title;
   }

   void BookItem::SetPublisher(Publisher pubTemp)
   {
      delete pub;
      pub = new Publisher(pubTemp);

   }


   void BookItem::SetYear(int Year)
   {
      this->Year = Year;
   }

   //COPY CONSTRUCTOR
   BookItem::BookItem(const BookItem& bkObject)
     :StockItem(bkObject), Authors(bkObject.GetAuthors()),Title(bkObject.GetT itle()),
          pub(bkObject.pub), Year(bkObject.GetYear())
   {

   }

   BookItem BookItem::operator=(const BookItem& temp)
   {

  if (this == &temp)
  {
  // IF THE RIGHT SIDE IS THE SAME AS THE LEFT SIDE
     return *this;
  }
     else
     {
     delete pub;
     Authors = temp.Authors;
     Title = temp.Title;
     pub = temp.pub;
     Year = temp.Year;

   return *this;
   }
   }

void BookItem::RecordPurchase(const int NumberPurchased,
const double &CostPrice)
{
double num = NumberPurchased * CostPrice;

SetTotalCost(num);
SetCostPrice(CostPrice);
SetNumberSold(NumberPurchased);

}


BookItem::~BookItem()
{
delete pub;
}


void BookItem::Print()
{
cout << endl;
cout << "Stock Item: " << GetTitle() << endl;

cout << "\tNumber Sold " << "\t- " << GetNumberSold() << endl;
cout << "\tTotal Revenue " << "\t- " << GetTotalRevenue() << endl;
cout << "\tTotal Cost " << "\t- " << GetTotalCost() << endl;
//cout << "\tAverage Profit " << "\t- " << GetAverageProfit() << endl;
cout << "\tAuthors " << "\t- " << GetAuthors() << endl;
cout << "\tPublisher " << "\t- " << GetPublisher() << endl;
}

__________________
gbilios