Kayen, R. E., & Barnhardt, W. A. (2007). Seismic stability of the Duwamish River Delta, Seattle, Washington. U.S. Dept. of the Interior, U.S. Geological Survey.

Kayen, Robert E., and Walter A. Barnhardt. Seismic Stability of the Duwamish River Delta, Seattle, Washington. Reston, Va.: U.S. Dept. of the Interior, U.S. Geological Survey, 2007.

Kayen, Robert E., and Walter A. Barnhardt. Seismic Stability of the Duwamish River Delta, Seattle, Washington. U.S. Dept. of the Interior, U.S. Geological Survey, 2007.