Snyder, David.; Adams, William Hampton; Butler, Brian M. (1997). Archaeology and historic preservation in Palau. Anthropology research series / Division of Cultural Affairs, Republic of Palau 2. San Francisco: U.S. National Park Service. Archived from the original on 2021-06-07. Retrieved 2021-06-07.
Snyder, David.; Adams, William Hampton; Butler, Brian M. (1997). Archaeology and historic preservation in Palau. Anthropology research series / Division of Cultural Affairs, Republic of Palau 2. San Francisco: U.S. National Park Service. Archived from the original on 2021-06-07. Retrieved 2021-06-07.