Rujukan WikiPedia: BP http://www.bp.com/sectiongenericarticle.do?categor... http://www.fundinguniverse.com/company-histories/t... http://www.latimes.com/news/nation/nationnow/la-na... http://news.nationalgeographic.com/news/2006/03/03... http://www.nyse.com/about/listed/lcddata.html?tick... http://www.scientificamerican.com/article/is-using... http://www.time.com/time/business/article/0,8599,1... http://www.boerse-frankfurt.de/en/equities/search/... //doi.org/10.1017%2FS0032247412000137 http://isni.org/isni/0000000107909434
