Sumber ilmu fisika
Kamis, 20 September 2012
Minggu, 16 September 2012
http://www.proprofs.com/quiz-school/story.phttp://www.proprofs.com/quiz-school/story.php?title=gelombang_2hp?title=gelombang_2
Rabu, 02 November 2011
Jumat, 16 April 2010
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