Q. How do I cite a conference paper from an organizational symposium in APA format.

The basic format is:

Author Last Name, First Initial. (Year, Month). Title of Paper. Name of conference, Location.

Example

Thygesen, N. (2011, April). Governance in the Euro area: Approaching an optimum currency area?  

      Paper presented for Panel 8 of the Institute for New Economic Thinking, Bretton Woods.

For more information see: p. 206, section 7.04 of the APA Manual and the post from the APA Style Blog on citing meeting materials