Butterman, William C.; Brooks, William E.; Reese, Jr., Robert G. Mineral Commodity Profile: Cesium(PDF). United States Geological Survey. 2004 [2009-12-27]. (原始内容存档(PDF)于2007-02-07).
Butterman, William C.; Brooks, William E.; Reese, Jr., Robert G. Mineral Commodity Profile: Cesium(PDF). United States Geological Survey. 2004 [2009-12-27]. (原始内容存档(PDF)于2007-02-07).