In RDA you can transcribe what is actually on the source in the series
statement. In RDA you can even use sources outside the resource see
However you can make a relationship to the series as a whole. In MARC
this is what we do when we use an 830. In RDA this is a whole-part
relationship and it obviates the need to relate directly to other membrs
of the series.
Of course, there may be other types of relationship between the specific
volumes of a series that you need to bring out, for example if there was
a sequential relationship between the resource being catalogued and
another volume in the series, but not reflected by the series numbering.
These relationsbips can be mande using authorised access points, if you
have enough information, or using structured or unstructured