4R. H. Petrucci,F. G. Herring,J. D. Madura,C. Bissonnette.General Chemistry-Principles and Modern Applications tenthEdition. Toronto,Ontario:Pearson Canada Inc.,2011,Chapter12,Section 12.1.
5P. Atkins,L. Jones,L. Laverman. New York:W. H. Freemanand Company,2013,Chapter 6,Section 6.1.
6M. S. Silberberg. Principles of General Chemistry secondEdition,New York:a business unit of The McGraw-Hill Companies,Inc.,2008,Chapter 12,Section 12.3.