23.豆类植物进入了密西西比河流域:Deborah M. Pearsall, “People, Plants, and Culinary Traditions.” The Oxford Handbook of North American Archaeology, 73-84.
24.玉米、豆类和南瓜:Alice Beck Kehoe, America Before the European Invasions (2002):177页提及卡霍基亚人被磨过的牙齿,178页提及玉米、豆类和南瓜。
25.当地居民并不仅仅依赖于种植的农作物:Timothy R. Pauketat, Ancient Cahokia and the Mississippians (2004): 7-9.
26.卡霍基亚:Justin Jennings, Globalizations and the Ancient World (2011):83—84页提到了卡霍基亚的人口,87—88页提到了卡霍基亚的地区影响力,92—95页提到了斯皮罗。