แหล่งที่มา WikiPedia: ซ็องนัม http://www.nowcom.co.kr/company/location.html http://www.nowcom.co.kr/images/nowcom/img_map2.jpg http://www.seongnam.go.kr/EN/ http://www.pangyotechnovalley.org/html/introduce/c... http://www.pangyotechnovalley.org/image/introduce/... //tools.wmflabs.org/geohack/geohack.php?pagename=%... https://commons.wikimedia.org/wiki/Category:Seongn...
