D'Altroy, Terence N. The Incas, John Wiley & Sons, Incorporated, 2014.[1]
This is a book covering the topic.
History of the Incas, by Pedro Sarmiento de Gamboa, and the Execution of the Inca Tupac Amaru, by Captain Baltasar de Ocampo : With a Supplement: a Narrative of the Vice-Regal Embassy to Vilcabamba, 1571, and of the Execution of the Inca Tupac Ama..., edited by Sir Clements Markham, Hakluyt Society, 2010.[2]
This book has been vetted by a university press, covering the topic and aiding in establishing notability.
Davies, Nigel. The Incas, Norman : University Press of Colorado 2007.[3]
This is a book covering the topic in depth.
References
^D'Altroy, N. Terence (2014). The Incas. Hoboken : Wiley.
ISBN9781118610602.