^Weightman, Barbara A. (2011), Dragons and Tigers: A Geography of South, East, and Southeast Asia (ấn bản thứ 3), John Wiley & Sons, tr. 266, ISBN978-0-470-87628-2.
^Ridgell, Reilly (1995), Pacific Nations and Territories: the Islands of Micronesia, Melanesia, and Polynesia (ấn bản thứ 3), Bess Press, tr. 79, ISBN1-57306-006-2.
^Oxford Business Group (2007), The Report: Emerging Saudi Arabia 2007, Oxford Business Group, tr. 114, ISBN978-1-902339-66-5 ("The Kingdom has no rivers, lakes or any permanent body of standing water...").