Foreign keys and inheritance

I have two classes of objects, A and B, where B is just a special case
of A.  (I.e., to describe a B-type object I need to specify the same
fields as for an A-type object, plus a whole bunch additional fields
specific to B alone.)  Furthermore, there's a third class T that is in
a many-to-one relation with A (and hence also B) objects.

The question is, what's the "best practice" for implementing this
situation in PostgreSQL.  My first idea was to define B as inheriting
from A, which is OK, except that I have not figured out how to
implement the reference from T.  Is inheritance indeed the right tool
for this problem, or should I use a different approach?

TIA!

kj