In APA (and the other styles that I tried just to see if it was a problem specific to APA) the publisher information is not displayed on the reference page.

Papers: Hyland, K. (2004). Genre and second language writing. Ann Arbor, MI: University of Michigan Press.

Manuscripts : Hyland, K. (2004). Genre and second language writing.

I am using Papers 3 with Manuscripts 1.0.37-1-G10270