http://sefinx.blogspot.com/2012/08/definisi-arus-ac-dan-dc.html

http://sains.kompas.com/read/2012/09/13/1615243/Mengenal.Nikola.Tesla.Penemu.Arus.Bolak-balik

http://kolom-biografi.blogspot.com/2009/01/biografi-thomas-alva-edison.html

http://id.wikipedia.org/wiki/Thomas_Alva_Edison

http://kolom-biografi.blogspot.com/2011/09/biografi-nikola-tesla-ilmuwan-listrik.html