Tolong jelaskan mengenai Sumber dari Rano Raraku

P.E. Baker (1968) "Preliminary Account of Recent Geological Investigations on Easter Island." Geological Magazine 104 (2): 116-122

J.R. Flenley, S.M. King, J.T. Teller, M.E. Prentice, J. Jackson and C. Chew (1991). "The Late Quarternary Vegetational and Climatic History of Easter Island." Journal of Quartrnary Science 6:85-115.

Jo Anne Van Tilburg (1994). "Easter Island Archaeology, Ecology and Culture." London and Washington, D.C. British Museum Press and Smithsonian Institution Press ISBN 0-7141-2504-0 http://www.sscnet.ucla.edu/ioa/eisp/