Barker, C. F. (2005). Under Michigan: The Story of Michigan's Rocks and Fossils. Wayne State University Press.
Cita Chicago Style (17a ed.)Barker, Charles Ferguson. Under Michigan: The Story of Michigan's Rocks and Fossils. Detroit: Wayne State University Press, 2005.
Cita MLA (8a ed.)Barker, Charles Ferguson. Under Michigan: The Story of Michigan's Rocks and Fossils. Wayne State University Press, 2005.
Precaución: Estas citas no son 100% exactas.