How do you handle unruly roommates? Former good friends who come home wasted with ransoms and slam doors e?

We used to be good friends but I'm a senior in college and they aren't too serious about school...i signed a binding lease so I have to love here another semester but they are two of the skankiest girls I have ever met, ive gotten to the point where I question why I was ever friends with them to begin with. I honestly don't care what they do or how they live their life, but it's getting to the point where they are disrupting my nights...no one wants to be waken up at 1 am by the sound of slutty girls on a Wednesday night! Help...tell me what to say to make them understand