Rujukan WikiPedia: Istana_Musim_Panas http://whc.unesco.org/en/list/880 //tools.wmflabs.org/geohack/geohack.php?pagename=I... https://www.wikidata.org/wiki/Q4132#P17 https://www.wikidata.org/wiki/Q4132?uselang=ms#P52...