No kurienes tev pārliecība, ka "''oficiālā'' zinātne cenšas izlikties, ka šie artefakti nav pētīšanas vērti":

Jean Pierre Protzen, “Who Taught the Inca Stonemasons Their Skills? A Comparison of Tiahuanaco and Inca Cut-Stone Masonry,” The Journal of the Society of Architectural Historians, Vol. 56, No. 2 (Jun., 1997), pp. 146-167.


Jean Pierre Protzen, “Inca Quarrying and Stone Cutting,” The Journal of the Society of Architectural Historians, Vol. 44, No. 2 (May, 1985), pp. 161-182


Susan A. Niles, “Niched Walls in Inca Design,” The Journal of the Society of Architectural Historians, Vol. 46, No. 3 (Sep., 1987), pp. 277-285