* {{Cite book |ref=harv| last= Fogel| first= Robert William | last2 = Engerman| first2 = Stanley L. | title = Time on the Cross: The Economics of American Negro Slavery| year = 1995| publisher = W W Norton & Company Incorporated|isbn=978-0-393-31218-8|pages= 33-34}}
* {{Cite book |ref=harv| last = Osborne| first = Harold| title = Bolivia: A Land Divided | publisher = London: Royal Institute of International Affairs | year = 1954}}
* {{Cite book |ref=harv| last= Robins| first= Nicholas A.| last2 = Jones| first2 = Adam| title = Genocides by the Oppressed: Subaltern Genocide in Theory and Practice| url = https://books.google.com/books?id=AX3UCk_PdEwC| accessdate = 14. 7. 2013| year = 2009| publisher = Indiana University Press|isbn=978-0-253-22077-6|pages= 1-2}}
* {{Cite book |ref=harv| last = Kolata| first = Alan L. | title = The Tiwanaku: Portrait of an Andean Civilization| year = 1993| publisher = Wiley|isbn=978-1-55786-183-2}}
* {{Cite book |ref=harv| last = Kolata| first = Alan L. | title = Valley of the spirits: a journey into the lost realm of the Aymara| year = 1996| publisher = Wiley|isbn=978-0-471-57507-8}}
* {{Cite book |ref=harv| last = Fagan| first = Brian M. | title = The seventy great mysteries of the ancient world: unlocking the secrets of past civilizations| year = 2001| publisher = Thames and Hudson|isbn=978-0-500-51050-6}}
