Order by sub-select

In the following query:
SELECT name, contact, phone, email FROM eforward.address
        WHERE gsb IN ( SELECT gsb FROM eforward.ibox
                WHERE ibx IN ( SELECT DISTINCT ibx FROM eforward.partner
                        WHERE pibx = 'MTCBIN'));

How would I sort the result by eforward.partner.ibx?  I tried an 'ORDER
BY' clause in the sub-select, but that doesn't appear to work.  (If you
drop the outer query, the order does appear to be maintained however.)

I'm using postgres 8.1.0.

Daniel T. Staal

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