Organic Chemistry: Reactions, Mechanisms, and Structure," 6th Ed., New York, NY, US: Wiley & Sons, , see , accessed 19 June 2015. Theory L.P. Hammett, 1970, Physical Organic Chemistry, 2nd Edn., New York, NY, US: McGraw-Hill. John Shorter, 1982, Correlation Analysis of Organic Reactivity, Chichester 1982. Otto Exner, 1988, Correlation Analysis of Chemical Data, New York, NY, US: Plenum. Surveys of descriptors Roberto Todeschini, Viviana Consonni, Raimund Mannhold, Hugo Kubinyi & Hendrik Timmerman, 2008, "Entry: Electronic substituent constants (Hammet substituent constants, σ electronic constants)," in Handbook of Molecular Descriptors, Vol. 11 of Methods and Principles in Medicinal Chemistry (book series), pp. 144–157, New York, NY, US: John Wiley & Sons, , see , accessed 22 June 2015. N. Chapman, 2012, Correlation Analysis in Chemistry: Recent Advances, New York, NY, US: Springer Science & Business, , see , accessed 22 June 2015. History John Shorter, 2000, "The prehistory of the Hammett equation," Chem. Listy, 94:210-214. Frank Westheimer, 1997, "Louis Plack Hammett, 1894—1987: A Biographical Memoir," pp. 136–149, in Biographical Memoirs, Washington, DC, US: National Academies Press, see , accessed 22 June 2015. Physical organic chemistry Equations