I'm proofing a document that employs the APA citation style. It contains several citations of the form:
(Michaelson, 2000; cattle only)
This seems wrong to me, especially since the semi-colon is used to separate references. However, I can't find anything in the Sixth Edition that gives me any guidance one way or another.
Personally, I would either put the "cattle only" bit in square brackets, e.g.
(Michaelson, 2000 [cattle only])
or rewrite to cite non-parenthetically, e.g.:
"... as was also noted by Michaelson (2000), but for cattle only."
I'd prefer to go to the client with more than "I don't think you should do this because it violates my sense of aesthetics".
Does the APA Sixth Edition give any guidance on how extra information should be displayed?