Copeland, T., & Gunns, A. F. (1993). The Centralia tragedy of 1919: Elmer Smith and the Wobblies. University of Washington Press.

Copeland, Tom, and Albert F. Gunns. The Centralia Tragedy of 1919: Elmer Smith and the Wobblies. Seattle: University of Washington Press, 1993.

Copeland, Tom, and Albert F. Gunns. The Centralia Tragedy of 1919: Elmer Smith and the Wobblies. University of Washington Press, 1993.