- Palmer , W.G. 1965 . A History of the Concept of Valency to 1930 Cambridge C. A. Russell, The History of Valency (Leicester, 1971).
- Bykov , G.V. 1965 . Historical Sketch of the Electron Theories of Organic Chemistry . Chymia , 10 : 199 – 253 . (p. 207).
- Kohler , R.E. Jr . 1975 . The Lewis-Langmuir Theory of Valence and the Chemical Community, 1920–1928 . Historical Studies in the Physical Sciences , 6 : 431 – 468 . (p. 444).
- Fry , H.S. 1911 . Einige Anwendungen des Elektronenbegriffs der positiven und negativen Wertigkeit, III . Zeitschrift der physikalischen Chemie , 76 : 591 – 600 . (p. 591).
- Kohler , R.E. Jr . 1975 . The Lewis-Langmuir Theory of Valence and the Chemical Community, 1920–1928 . Historical Studies in the Physical Sciences , 6 : 431 – 468 . and R. E. Kohler, Jr, ‘G. N. Lewis's Views on Bond Theory’, British Journal for the History of Science, 8 (1975), 233–9.
- Landé , A. 1920 . Würfelatome, periodisches System und Molekülbildung . Zeitschrift für Physik , 2 : 380 – 404 . (p. 380).
- Kragh , H. 1979 . Niels Bohr's Second Atomic Theory . Historical Studies in the Physical Sciences , 10 : 123 – 186 .
- Fowler , R.H. 1923 . Bohr's Atom in Relation to the Problem of Covalency . Transactions of the Faraday Society , 19 : 459 – 468 .
Annals of Science
Volume 40, 1983 - Issue 3