

Bibliografi
1http://www.loc.gov/rr/scitech/mysteries/christmaslights.html; akses 13 Mei 2015 00: 11
2http://www.menloparkmuseum.org/history/thomas-edison-and-menlo-park/ akses 13 Mei 2015 00: 13
Iklan
1http://www.loc.gov/rr/scitech/mysteries/christmaslights.html; akses 13 Mei 2015 00: 11
2http://www.menloparkmuseum.org/history/thomas-edison-and-menlo-park/ akses 13 Mei 2015 00: 13