1 2 Sailing Directions 161 (Enroute) - South China Sea and the Gulf of Thailand (ấn bản 13). Bethesda, Maryland: National Geospatial-Intelligence Agency. 2011. tr. 9.
↑ Samuels, Marwyn S. (1982). Contest for the South China Sea. New York: Methuen. tr. 190. ISBN9780416331400.
↑ Hancox, David; Prescott, Victor (1995). A Geographical Description of the Spratly Islands and an Account of Hydrographic Surveys amongst Those Islands. Maritime Briefings 1 (6). University of Durham, International Boundaries Research Unit. tr. 9. ISBN9781897643181.