A map of Singapore.
National Foreign Assessment Center, <a href="https://en.wikipedia.org/wiki/Central_Intelligence_Agency" class="extiw" title="w:Central Intelligence Agency">Central Intelligence Agency</a>.
<cite class="book" style="font-style:normal">National Foreign Assessment Center, Central Intelligence Agency (2004)      <i> <a rel="nofollow" class="external text" href="http://www.cia.gov/cia/publications/factbook/print/sn.html">The World Factbook</a></i>, <a href="https://en.wikipedia.org/wiki/en:Washington,_D.C." class="extiw" title="w:en:Washington, D.C."><span title="capital city of the United States">Washington, D.C.</span></a>:  <a href="https://en.wikipedia.org/wiki/Central_Intelligence_Agency" class="extiw" title="w:Central Intelligence Agency">Central Intelligence Agency</a>. Archived from <a rel="nofollow" class="external text" href="https://web.archive.org/web/20050401072219/http://www.cia.gov/cia/publications/factbook/print/sn.html">the original</a> on 1 April 2005.  <small><a href="https://en.wikipedia.org/wiki/Online_Computer_Library_Center" class="extiw" title="en:Online Computer Library Center">OCLC</a>:   <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/57135751">57135751</a>. </small></cite> (Revision of 10 February 2005.)