C++: Why do you need references when you have pointers? [duplicate]

Question

Using pointers alone you can’t properly pass-by-reference or return-by-reference.
Some methods require a reference. How would you implement a copy-constructor?
Sometimes you need to enforce aliasing. You can’t do that with pointers – they can be changed. References cannot bind to something different. So when you initialize a reference, you guarantee it will refer to the same object through its scope.
The safety issue
(const)References can bind to temporary objects. To create a temporary pointer, you’d need to free it inside the method you pass it to. But you can’t tell if it’s a temporary or not inside.