Bob's nickname was “Elvis,” a 'reference to' the way he styled his hair. [=people called Bob “Elvis” because he styled his hair in the same way Elvis Presley did]
The course covers ancient history 'with' special 'reference to' the Roman Empire. [=the course is about ancient history and especially about the Roman Empire]
I have something further to add 'with reference to' [='with respect to', 'in regard to'] what was said earlier.
(..) Any follow-up on her? Lecter altered or destroyed most of his patients' histories, so there's no record of anyone named Mofet, but I thought the "yourself" reference was too hokey for Lecter, so I figured he's from Baltimore and I looked in the phone book and there's a "Your Self" storage facility (..)1991 The Silence of the Lambs