William L. Masterton, Cecile N. Hurley, "Chemistry: Principles and Reactions", 6th edition. Brooks/Cole Cengage Learning, 2009, s.13 (Google books) 1 Aralık 2016 tarihinde Wayback Machine sitesinde arşivlendi.
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William L. Masterton, Cecile N. Hurley, "Chemistry: Principles and Reactions", 6th edition. Brooks/Cole Cengage Learning, 2009, s.13 (Google books) 1 Aralık 2016 tarihinde Wayback Machine sitesinde arşivlendi.