Citing different papers which use different notation for the same concept, Not sure if this is the place to ask about this. But for lack of knowledge of a better resource, I turn here.

When citing papers which use the different notation for the same model, is it better to leave the notation as is when citing each source, or, to retain consistency conform to one notation? 

If I were to conform to one notation, does the more recent source take priority when choosing notation or the earlier source? Additionally how would it be formatted when quoting the source with the altered notation?
This probably varies between fields, but in my field, mathematics, what I"d do is to explain the notation that I want to use and then express other people's results in that notation. I'd probably say something like "XXX proved [citation] a theorem that, in the notation explained above, says YYY."