(See [Icazbalceta].)

Sarmiento de Gamboa, Pedro:

1907.

The History of the Incas.
Edited by Sir Clements Markham for the Hakluyt Society. London.

Squier, E. George:

1877.

Incidents of Travel and Exploration in the Land of the Incas.
New York.

Tello, Julio C.:

1912.

Prehistoric Trephining among the Yauyos of Peru.
Int. Cong. Am., XVIIIth Sess., pp. 75-83.