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.
(..) still on for putt-putt golf,right? Hey,I just ran into penny. She seemed upset about something. I think it's her time of the month. I marked the calendar for future reference. What's with the fish? It's an experiment. What happened to your scrambled egg research? Oh,that was a dead end. (..)2007 TvShow: The Big Bang Theory Title: The Luminous Fish Effect Season: 1 Episode 4