Chow, J. C., Watson, J. G., Frazier, C. A. (2008). Method No. 822B: X-ray fluorescence spectrometry for multi-element analysis of airborne particulateMethod No. 822B: X-ray fluorescence spectrometry for multi-element analysis of airborne particulate, In Methods of Air Sampling and Analysis, 4th ed., Air & Waste Management Association: Pittsburgh, PA