There probably is not. If you have the citation data in Zotero, you can export it in the APA format. If you are more specific about your problem, then it would be possible to give a more specific answer.

If you have the data stored in Zotero, then it is possible to use the server API to generate a bibliography in APA format.

Thanks mronkko. I guess I can do a HTTPrequest and get what I need then.

But where do I find the server API documentation? (I looked under "Documentation", but I can't find it.)

Thanks Rintze.

userID and groupID are integers, not user/group names.

From the page:

User IDs are different from usernames and can be found on the API Keys page and in OAuth responses.

BTW: /<users>/<userID>/groups => /users/<userID>/groups
on http://www.zotero.org/support/dev/server_api/read_api

Don't know what you're saying here.

Thanks Dan and adamsmith.

I can not find a way to get the groupID.

Thanks Dan,
But https://api.zotero.org/users/<userID>/groups gives me just "forbidden".

I am a bit stuck here, perhaps. What I want to do is just display a formatted reference (for the item in the library) in a bookmarklet window.

Maybe something totally different would be useful for me then. Would it be possible to add a field with a formatted reference in the library item web page? (I guess that could be useful to many people.)

:-)