(en) Ralph G. Pearson, « Hard and soft acids and bases, HSAB, part I: Fundamental principles », J. Chem. Educ., no 45, , p. 581–586 (lire en ligne [accès abonné])
(en) Ralph G. Pearson, « Hard and soft acids and bases, HSAB, part II: Underlying theories », J. Chem. Educ., no 45, , p. 643–648 (lire en ligne [accès abonné])
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(en) Ya. I. Delchev, A. I. Kuleff, J. Maruani, Tz. Mineva, F. Zahariev, Jean-Pierre Julien (dir.), Jean Maruani (dir.) et Didier Mayou (dir.), Recent Advances in the Theory of Chemical and Physical Systems, New York, Springer-Verlag, (ISBN978-1-4020-4527-1, lire en ligne), « Strutinsky's shell-correction method in the extended Kohn-Sham scheme: application to the ionization potential, electron affinity, electronegativity and chemical hardness of atoms », p. 159–177
(en) Robert G. Parr et Ralph G. Pearson, « Absolute hardness: companion parameter to absolute electronegativity », J. Am. Chem. Soc., vol. 105, no 26, , p. 7512–7516 (DOI10.1021/ja00364a005)
(en) Ralph G. Pearson, « Chemical hardness and density functional theory », J. Chem. Sci., vol. 117, no 5, , p. 369–377 (DOI10.1007/BF02708340, lire en ligne)
(en) Nathan Kornblum, Robert A. Smiley, Robert K. Blackwood et Don C. Iffland, « The Mechanism of the Reaction of Silver Nitrite with Alkyl Halides. The Contrasting Reactions of Silver and Alkali Metal Salts with Alkyl Halides. The Alkylation of Ambident Anions », J. Am. Chem. Soc., vol. 77, no 23, (DOI10.1021/ja01628a064)
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(en) Ralph G. Pearson, « Chemical hardness and density functional theory », J. Chem. Sci., vol. 117, no 5, , p. 369–377 (DOI10.1007/BF02708340, lire en ligne)
iupac.org
(en) IUPAC, « Glossary of terms used in theoretical organic chemistry », Pure Appl. Chem., vol. 71, no 10, , p. 1919-1981 (lire en ligne, consulté le )
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(en) E.-C. Koch, « Acid-Base Interactions in Energetic Materials: I. The Hard and Soft Acids and Bases (HSAB) Principle – Insights to Reactivity and Sensitivity of Energetic Materials », Propellants Explos. Pyrotech., no 30, , p. 5 (lire en ligne)
(en) Ralph G. Pearson, Chemical Hardness – Applications From Molecules to Solids, Weinheim, Wiley-VCH, , 1–198 p. (présentation en ligne)