Collard, S. B. (2005). The prairie builders: Reconstructing America's lost grasslands. Houghton Mifflin Co..
Cita Chicago Style (17a ed.)Collard, Sneed B. The Prairie Builders: Reconstructing America's Lost Grasslands. Boston: Houghton Mifflin Co., 2005.
Cita MLA (8a ed.)Collard, Sneed B. The Prairie Builders: Reconstructing America's Lost Grasslands. Houghton Mifflin Co., 2005.
Precaución: Estas citas no son 100% exactas.