Schaaf, J. M. (2004). Witness: Firsthand accounts of the largest volcanic eruption in the twentieth century. [Washington, D.C.]: National Park Service, U.S. Dept. of the Interior.
Chicago Style CitationSchaaf, Jeanne M. Witness: Firsthand Accounts of the Largest Volcanic Eruption in the Twentieth Century. [Washington, D.C.]: National Park Service, U.S. Dept. of the Interior, 2004.
MLA CitationSchaaf, Jeanne M. Witness: Firsthand Accounts of the Largest Volcanic Eruption in the Twentieth Century. [Washington, D.C.]: National Park Service, U.S. Dept. of the Interior, 2004.
Warning: These citations may not always be 100% accurate.