1. Vgl. : Structure and Mechanism in Organic Chemistry. 2. Aufl. Cornell University Press, Ithaca 1969
2. The origin of the inductive effect
3. Vgl. z. B. u. : The Theory of Organic Chemistry. Prentice-Hall, New York 1946.
4. Definition of “Inductive” Substituent Constants
5. Actual effects controlling the acidity of carboxylic acids