according to this web page:
http://www.scribd.com/doc/248842/Tuition-Payment-information-for-Babson-MBA-program
it is:
CTZIUS33
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The routing number I believe might be different. You should call the bank or look at the first set of digits on your checks.
There is no IBAN for Citizens Bank in Massachusetts. However, the SWIFT code for Citizens Bank in MA is CTZIUS33.
They only publish the head office number, the three Xs are replaced with the branch identifier.
SVRNUS33XXX