Bolivia: Recommended Reading For further study about Bolivia, Martin Gray recommends the following books and travel guides: Ritual and Pilgrimage in the Ancient Andes: The Islands of the Sun and the Moon The Secret of the Incas:Myth, Astronomy, and theWar Against Time Fingerprints of the Gods Tiwanaku: Ancestors of the Inca The Tiwanaku: Portrait of anAndean Civilization(Peoples of America) Ancient Tiwanaku (CaseStudies in Early Societies) From Viracocha to the Virgin of Copacabana: Representation of the Sacred at Lake Titicaca Mail