^Cameron, Ian (1990). Kingdom of the Sun God: a history of the Andes and their people. New York: Facts on File. ISBN 0-8160-2581-9.
^Incas: lords of gold and glory. New York: Time-Life Books. 1992. p. 143. ISBN 0-8094-9870-7.
^Demarest, Arthur Andrew; Conrad, Geoffrey W. (1984). Religion and empire: the dynamics of Aztec and Inca expansionism. Cambridge, UK: Cambridge University Press. p. 97. ISBN 0-521-31896-3.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Earle, Timothy K.; Johnson, Allen W. (1987). The evolution of human societies: from foraging group to agrarian state. Stanford, Calif: Stanford University Press. ISBN 0-8047-1339-1.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Ordish, George; Hyams, Edward (1996). The last of the Incas: the rise and fall of an American empire. New York: Barnes & Noble. ISBN 0-88029-595-3.{{cite book}}: CS1 maint: multiple names: authors list (link)
^Popenoe, Hugh (1989). Lost crops of the Incas: little-known plants of the Andes with promise for worldwide cultivation. Washington, D.C.: National Academy Press. ISBN 0-309-04264-X. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
^Weatherford, J. McIver (1988). Indian givers: how the Indians of the Americas transformed the world. New York: Fawcett Columbine. p. 63. ISBN 0-449-90496-2. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
^History of the Inca realm. Cambridge, UK: Cambridge University Press. 1999. ISBN 0-521-63759-7. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)
^Mann, Charles Kellogg. 1491: New Revelations of the Americas Before Columbus. Vintage. ISBN 1-4000-3205-9. {{cite book}}: Cite has empty unknown parameter: |coauthors= (help)