Geological Survey (U.S.) & Bergquist, W. E. (1981). Worldwide directory of national earth-science agencies and related international organizations. U.S. Dept. of the Interior, Geological Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and Wenonah E. Bergquist. Worldwide Directory of National Earth-science Agencies and Related International Organizations. [Reston, Va.]: U.S. Dept. of the Interior, Geological Survey, 1981.
MLA (9th ed.) CitationGeological Survey (U.S.) and Wenonah E. Bergquist. Worldwide Directory of National Earth-science Agencies and Related International Organizations. U.S. Dept. of the Interior, Geological Survey, 1981.
Warning: These citations may not always be 100% accurate.