Bibliography
See the page on Sources on Pre-Columbian America for the pre-colonial period.
The main sources I have used for South America are:
C.L. Lombardi, J.V. Lombardi and K.L. Stoner, Latin American History: A Teaching Atlas, Conference of Latin American History / University of Wisconsin, 1983
G. Pendle, A History of Latin America, Pelican, 1983
S.Z. Stone, The Heritage of the Conquistadors, University of Nebraska, 1990
These have been supplemented by articles in Wikipedia and Encyclopedia Britannica.