You cannot just put MBA on your resume without identifying its source. Once you name Laurentian, you give yourself away. Managers know what kind of school it is. It could even hurt your chances. Because without it, people may think that you are able to get into a better school based on your other qualifications if you choose to do one. It is another story if you just want to make yourself happy by putting the three letters behind your name on your business card. Then, Laurentian is the shortest and cheapest way to go.