APA-referens (7:e uppl.)

Bohlen, S. R. (1998). Geology for a changing world: A science strategy for the Geologic Division of the U.S. Geological Survey, 2000-2010. U.S. G.P.O. Free on application to U.S. Geological Survey, Information Services.

Chicago-referens (17:e uppl.)

Bohlen, Steven R. Geology for a Changing World: A Science Strategy for the Geologic Division of the U.S. Geological Survey, 2000-2010. Washington, Denver, CO: U.S. G.P.O. Free on application to U.S. Geological Survey, Information Services, 1998.

MLA-referens (9:e uppl.)

Bohlen, Steven R. Geology for a Changing World: A Science Strategy for the Geologic Division of the U.S. Geological Survey, 2000-2010. U.S. G.P.O. Free on application to U.S. Geological Survey, Information Services, 1998.