34.巧克力的痕迹:Michael Bawaya, “A Chocolate Habit in Ancient North America.” Science 345.6200 (2014): 991.
35.《波波尔·乌》:Dennis Tedlock, Popol Vuh: The Definitive Edition of the Mayan Book of the Dawn of Life and the Glories of Gods and Kings (1996).
36.并不总是能被清晰地看出:Ruth M. Van Dyke, “Chaco’s Sacred Geography.” In Search of Chaco: New Approaches to an Archaeological Enigma, ed. David Grant Noble (2004): 79-85.
37.普韦布洛邦尼托:Thomas C. Windes, “This Old House: Construction and Abandonment at Pueblo Bonito.” Pueblo Bonito, ed. Jill E. Neitzel (2003): 14-32, 15.