*University of Colorado at Boulder, (2007) "CU-Boulder Archaeology Team Discovers First Ancient Manioc Fields In Americas", press release August 20, 2007, accessed August 29, 2007.
* University of Colorado at Boulder, (2007) "CU-Boulder Archaeology Team Discovers First Ancient Manioc Fields In Americas", press release August 20, 2007, accessed August 29, 2007.