1. G. N. Lewis , Valence and the Structure of Atoms and Molecules , Chemical Catalog Com. , New York , 1923
2. The Lewis acid-base definitions: a status report
3. S. E. Denmark and G. L.Beutner , Principles, Definitions, Terminology, and Orbital Analysis of Lewis Base-Lewis Acid Interactions Leading to Catalysis , in Lewis Base Catalysis in Organic Synthesis , ed. E. Vedejs and S. E. Denmark , Wiley-VCH , Weinhein , 2016 , ch. 2, pp. 31–54
4. What happens to molecules as they react? A valence bond approach to reactivity
5. The single electron shift as a fundamental process in organic chemistry: the relationship between polar and electron-transfer pathways