Geological Survey (U.S.), Lipman, P. W., & Mullineaux, D. R. (1982). The 1980 eruptions of Mount St. Helens, Washington. U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by the Supt. of Docs., U.S. G.P.O..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Geological Survey (U.S.), Peter W. Lipman, و Donal Ray Mullineaux. The 1980 Eruptions of Mount St. Helens, Washington. [Reston, Va.?] : Washington, D.C.: U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by the Supt. of Docs., U.S. G.P.O., 1982.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Geological Survey (U.S.), et al. The 1980 Eruptions of Mount St. Helens, Washington. U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by the Supt. of Docs., U.S. G.P.O., 1982.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.