@thesis{bachelor,
author={John Smith},
title={How to open snacks},
institution={University of NYC},
year = 2006,
month = 7,
day = 14,
addendum={Supervisor: Prof. Roger. Assistant supervisor: Dr. Dave.},
url={https://www.uniny.com/~smithj/b_abstract.pdf}
}

@thesis{master,
author={John Smith},
title={How to eat snacks},
institution={University of NYC},
year = 2012,
month = 7,
day = 14,
addendum={Supervisor: Prof. Roger. Assistant supervisor: Dr. Dave.},
url={https://www.uniny.com/~smithj/m_abstract.pdf}
}